FujiFilm Assigned Fifteen Patents

Magnetic tape including characterized magnetic layer, tape cartridge, recording and reproducing device
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,522,180) developed by Kasada, Norihito, Kanagawa, Japan, for a “magnetic tape including characterized magnetic layer, tape cartridge, recording and reproducing device, and method of manufacturing.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein the combined thickness of the nonmagnetic layer and the magnetic layer is less than or equal to 0.60 .mu.m, the coefficient of friction as measured on the base portion of the surface of the magnetic layer is less than or equal to 0.35, at least the magnetic layer contains one or more components selected from the group consisting of a fatty acid and a fatty acid amide, and a C–H derived carbon, C, concentration calculated from a C–H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on the surface of the magnetic layer is greater than or equal to 45 atom %.”

The patent application was filed on December 15, 2016 (15/380,336).

Magnetic tape having characterized magnetic layer
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,522,179) developed by Kasada, Norihito, Minami-ashigara, Japan, for a “magnetic tape having characterized magnetic layer.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape is provided in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 .mu.m. The magnetic layer includes ferromagnetic hexagonal ferrite powder and an abrasive. The percentage of a plan view maximum area of the abrasive confirmed in a region having a size of 4.3 .mu.m.times.6.3 .mu.m of the surface of the magnetic layer by plane observation using a scanning electron microscope, with respect to the total area of the region, is equal to or greater than 0.02% and less than 0.06%. Further, the tilt cos .theta. of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.”

The patent application was filed on August 30, 2017 (15/690,906).

Magnetic tape having controlled surface properties of magnetic layer
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,522,171) developed by Kasada, Norihito, Kaneko, Tetsuya, and Ozawa, Eiki, Minami-ashigara, Japan, for a “magnetic tape having controlled surface properties of the magnetic layer.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape includes a non-magnetic support, a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support, and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is less than or equal to 0.60 .mu.m. The magnetic layer includes a timing-based servo pattern, and the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050.”

The patent application was filed on June 20, 2017 (15/627,696).

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,515,661) developed by Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape device and head tracking servo method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape device includes a magnetic tape including a magnetic layer, in which an intensity ratio of a peak intensity of a diffraction peak of a, (110) plane with respect to a peak intensity of a diffraction peak of a, (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and a C–H derived C concentration calculated from a C–H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.”

The patent application was filed on November 6, 2018 (16/182,083).

Magnetic tape having controlled surface properties of back coating layer and magnetic layer
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,515,660) developed by Oyanagi, Masahito, and Kasada, Norihito, Minami-ashigara, Japan, for a “magnetic tape having controlled surface properties of the back coating layer and magnetic layer.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape is provided in which the center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm, and the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050. A back coating layer includes one or more components selected from a fatty acid and a fatty acid amide. In addition, the C–H derived C concentration calculated from the C–H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed regarding the surface of the back coating layer at a photoelectron take-off angle of 10 degrees is greater than or equal to 35 atom %.”

The patent application was filed on June 9, 2017 (15/619,012).

Magnetic tape having characterized magnetic layer and magnetic recording
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,515,657) developed by Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for a “magnetic tape having characterized magnetic layer and magnetic recording and reproducing device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”Provided are a magnetic tape, in which a magnetic layer includes a ferromagnetic powder, a binding agent, and an oxide abrasive, .DELTA.SFD in a longitudinal direction of the magnetic tape calculated by Expression 1, .DELTA.SFD=SFD.sub.25.degree. C.-SFD.sub.-190.degree. C., is equal to or smaller than 0.50, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 .mu.m to 0.08 .mu.m, and a magnetic recording and reproducing device including this magnetic tape.”

The patent application was filed on September 27, 2018 (16/143,646).

Magnetic tape including characterized magnetic layer and magnetic tape device
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,510,370) developed by Ozawa, Eiki, Kaneko, Tetsuya, and Kasada, Norihito, Minami-ashigara, Japan, for a “magnetic tape including characterized magnetic layer and magnetic tape device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape is provided in which the total thickness of a non-magnetic layer and a magnetic layer is equal to or smaller than 0.60 .mu.m. The magnetic layer includes a timing-based servo pattern and also includes fatty acid ester. The full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before performing vacuum heating with respect to the magnetic tape is greater than 0 nm and less than or equal to 7.0 nm, while the same value measured after performing the vacuum heating is also greater than 0 nm and less than or equal to 7.0 nm. Further, the difference between a spacing measured after performing the vacuum heating and a spacing measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.”

The patent application was filed on June 19, 2017 (15/626,832).

Magnetic tape having characterized magnetic particles and magnetic tape device
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,510,369) developed by Kaneko, Tetsuya, Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for a “magnetic tape having characterized magnetic particles and magnetic tape device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape includes a non-magnetic support, a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support, and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is less than or equal to 0.60 .mu.m. The magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and the magnetic layer includes an abrasive. In addition, the tilt cos .theta. of the ferromagnetic hexagonal ferrite powder with respect to the surface of the magnetic layer acquired by cross section observation performed using a scanning transmission electron microscope is 0.85 to 1.00.”

The patent application was filed on June 19, 2017 (15/626,355).

Magnetic tape including characterized magnetic layer and magnetic tape device
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,510,368) developed by Ozawa, Eiki, Kaneko, Tetsuya, and Kasada, Norihito, Minami-ashigara, Japan, for a “magnetic tape having characterized magnetic particles and magnetic tape device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape is provided in which the total thickness is less than or equal to 5.30 .mu.m. The magnetic layer includes a timing-based servo pattern and also a fatty acid ester, and the magnetic layer surface Ra is less than or equal to 1.8 nm. The full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before performing vacuum heating with respect to the magnetic tape is greater than 0 nm and less than or equal to 7.0 nm, while the same value measured after performing the vacuum heating is greater than 0 nm and less than or equal to 7.0 nm, also. The difference between a spacing measured after performing the vacuum heating and a spacing measured before performing the vacuum heating is greater than 0 nm and less than or equal to 8.0 nm.”

The patent application was filed on June 16, 2017 (15/624,897).

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,510,366) developed by Kaneko, Tetsuya, Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape device and head tracking servo method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape device includes: a magnetic tape, and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.”

The patent application was filed on December 26, 2018 (16/232,165).

Magnetic tape having characterized magnetic particles and magnetic tape device
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,504,546) developed by Kaneko, Tetsuya, Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape having characterized magnetic particles and magnetic tape device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic support. The total thickness of the magnetic tape is less than or equal to 5.30 .mu.m. The magnetic layer includes a timing-based servo pattern. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm. The ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and the magnetic layer includes an abrasive. Further, the tilt cos .theta. of the ferromagnetic hexagonal ferrite powder with respect to the surface of the magnetic layer acquired by cross section observation performed using a scanning transmission electron microscope is 0.85 to 1.00.”

The patent application was filed on June 21, 2017 (15/628,814).

Magnetic tape and magnetic tape device
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,497,389) developed by Kaneko, Tetsuya, Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape and magnetic tape device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm.sup.3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference, l.sub.99.9-l.sub.0.1) between a value l.sub.99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l.sub.0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.”

The patent application was filed on August 10, 2018 (16/100,289).

Magnetic tape including characterized magnetic layer
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,497,388) developed by Ozawa, Eiki, Kasada, Norihito, and Kurokawa, Takuto, Minami-ashigara, Japan, for a “magnetic tape including characterized magnetic layer.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape is provided having a total thickness of the non-magnetic and magnetic layers of less than or equal to 0.60 .mu.m. The C–H derived C concentration calculated from the C–H peak area ratio of C1s spectra by ESCA on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is greater than or equal to 45 atom %. The full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before and after vacuum heating with respect to the magnetic tape are respectively greater than 0 nm and less than or equal to 7.0 nm, and the difference between a spacing measured after the vacuum heating and a spacing measured before the vacuum heating is greater than 0 nm and less than or equal to 8.0 nm.”

The patent application was filed on June 16, 2017 (15/624,792).

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,497,386) developed by Ozawa, Eiki, and Kasada, Norihito, Minami-ashigara, Japan, for “magnetic tape device and head tracking servo method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape device includes a TMR head, servo head, and a magnetic tape, in which a magnetic layer of the magnetic tape includes fatty acid ester, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 7.0 nm, a difference between spacings before and after the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm, and .DELTA.SFD, =SFD.sub.25.degree. C.-SFD.sub.-#.degree. C.) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50.”

The patent application was filed on November 8, 2018 (16/184,312).

Magnetic tape device and reproducing method employing TMR reproducing head
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,497,384) developed by Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape device and reproducing method employing TMR reproducing head and magnetic tape with characterized magnetic layer.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape device includes a magnetic tape, and a Tunneling Magnetoresistive, (PAR) head as a reproducing head, in which the center line average surface roughness Ra measured regarding a surface of the magnetic layer of the magnetic tape is equal to or smaller than 2.0 nm, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and .DELTA.SFD in a longitudinal direction of the magnetic tape calculated by Expression 1: .DELTA.SFD=SFD.sub.25.degree. C.-SFD.sub.-190.degree. C. is equal to or smaller than 0.50, wherein, in Expression 1, the SFD.sub.25.degree. C. is a switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25.degree. C., and the SFD.sub.-190.degree. C. is a switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of -190.degree. C.”

The patent application was filed on February 20, 2018 (15/900,144).