FujiFilm Assigned Seven Patents

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (9,984,716) developed by Kaneko, Tetsuya, Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for a “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 TMR head, 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, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 a 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 December 26, 2017 (15/854,507).

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (9,984,712) developed by Ozawa, Eiki, Kaneko, Tetsuya, and Kasada, Norihito, Minami-ashigara, Japan, for a “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 contact angle with respect to 1-bromonaphthalene measured regarding a surface of the magnetic layer is 48.0.degree. to 53.0.degree.”

The patent application was filed on December 26, 2017 (15/854,329).

Magnetic tape having controlled surface properties of backcoat and magnetic layer
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (9,984,710) developed by Kasada, Norihito, Minami-ashigara, Japan, for a “magnetic tape having controlled surface properties of the backcoat and magnetic layer and method of manufacturing the same.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on the surface on one side of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the surface on the other side thereof, wherein the centerline average surface roughness Ra as measured on the surface on the magnetic layer side of the magnetic tape is less than or equal to 1.8 nm, the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the magnetic layer side of the magnetic tape is less than or equal to 0.050, and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the backcoat layer side is less than or equal to 0.060.”

The patent application was filed on December 14, 2016 (15/378,907).

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (9,978,414) developed by Kaneko, Tetsuya, Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for a “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 hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and a 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 0.95.”

The patent application was filed on December 26, 2017 (15/854,474).

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (9,972,351) developed by Kaneko, Tetsuya, Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for a “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 including: a magnetic tape, and a servo head, in which 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 logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050.”

The patent application was filed on December 26, 2017 (15/854,410).

Magnetic tape
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (9,959,894) developed by Omura, Kazufumi, Minami-ashigara, Japan, for a “magnetic tape and method of manufacturing the same.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “The magnetic tape comprises a nonmagnetic layer comprising nonmagnetic powder and binder on a nonmagnetic support, and comprises a magnetic layer comprising ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester, a fatty acid amide, and a fatty acid are contained in either one or both of the magnetic layer and the nonmagnetic layer, with the magnetic layer and nonmagnetic layer each comprising at least one selected from the group consisting of a fatty acid ester, a fatty acid amide, and a fatty acid, a quantity of fatty acid ester per unit area of the magnetic layer in extraction components extracted from a surface of the magnetic layer with n-hexane falls within a range of 1.00 mg/m.sup.2 to 10.00 mg/m.sup.2, and a weight ratio of the quantity of fatty acid ester per unit area of the magnetic layer to a combined total of a quantity of fatty acid amide and a quantity of fatty acid, quantity of fatty acid ester/(quantity of fatty acid amide+quantity of fatty acid, per unit area of the magnetic layer falls within a range of 1.00 to 3.00 in the extraction components.”

The patent application was filed on September 30, 2015 (14/870,618).

Magnetic tape winding-up
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (9,911,452) developed by Suzuki, Takayuki, Ohba, Tomohisa, Hatano, Yasushi, and Kouhara, Masatoshi, Kanagawa, Japan, for a “magnetic tape winding-up method, magnetic tape winding-up apparatus, manufacturing method of magnetic tape cartridge, and magnetic tape cartridge.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A winding-up method for winding up a magnetic tape, includes: winding up the magnetic tape around a takeup reel by laying turns one on top of another while causing the magnetic tape to run, and performing a tension control of maintaining tension exerted on a wound-up magnetic tape for a predetermined time.”

The patent application was filed on June 4, 2012 (13/487,440).