FujiFilm Assigned Six Patents

Magnetic tape having characterized magnetic layer and magnetic recording and reproducing device
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (11,361,793) developed by Kasada, Norihito, Minami-ashigara, Japan, for “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: “The magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which an absolute value .DELTA.N of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40, and 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.”

The patent application was filed on March 22, 2019 (16/361,597).

Magnetic tape having characterized magnetic layer and magnetic recording and reproducing device
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (11,361,792) developed by Kasada, Norihito, Minami-ashigara, Japan, for “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: “The magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 equal to or greater than 45 atom %, and an absolute value .DELTA.N of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40.”

The patent application was filed on March 22, 2019 (16/361,589).

Magnetic tape having characterized back coating layer, magnetic tape cartridge, and magnetic recording and reproducing
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (11,355,147) developed by Sawayashiki, Yoshihiro, and Kasada, Norihito, Minami-ashigara, Japan, for “magnetic tape having characterized back coating layer, magnetic tape cartridge, and magnetic recording and reproducing apparatus.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “The magnetic tape includes: a non-magnetic support, a magnetic layer that includes ferromagnetic powder on one surface side of the non-magnetic support, and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal strontium ferrite powder and .epsilon.-iron oxide powder, and the number of protrusions having a height of 50 nm or more and less than 75 nm on a surface of the back coating layer is 700 pieces/6400 .mu.m.sup.2 or less.”

The patent application was filed on March 20, 2020 (16/825,425).

Magnetic tape, cartridge, and apparatus
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (11,355,146) developed by Ozawa, Eiki, Kasada, Norihito, and Musha, Atsushi, Minami-ashigara, Japan, for “magnetic tape, magnetic tape cartridge, and magnetic tape apparatus.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “The magnetic tape includes a non-magnetic support and a magnetic layer, in which an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L.sub.99.9 of a cumulative distribution function of 99.9% and a value L.sub.0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and in which a difference between a spacing S.sub.after measured on a surface of the magnetic layer by an optical interferometry after ethanol cleaning and a spacing S.sub.before measured on the surface of the magnetic layer by an optical interferometry before ethanol cleaning is greater than 0 nm and 6.0 nm or less.”

The patent application was filed on January 30, 2020 (16/777,368).

Magnetic tape, cartridge, and apparatus
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (11,355,142) developed by Ozawa, Eiki, Kasada, Norihito, and Musha, Atsushi, Minami-ashigara, Japan, for “magnetic tape, magnetic tape cartridge, and magnetic tape apparatus.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “The magnetic tape includes a non-magnetic support, and a magnetic layer in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L.sub.99.9 of a cumulative distribution function of 99.9% and a value L.sub.0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and a difference between a spacing S.sub.after measured on a surface of the magnetic layer by an optical interferometry after methyl-ethyl-ketone cleaning and a spacing S.sub.before measured on the surface of the magnetic layer by an optical interferometry before methyl-ethyl-ketone cleaning is greater than 0 nm and 15.0 nm or less.”

The patent application was filed on January 30, 2020 (16/777,418).

Recording tape cartridge
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (11,335,368) developed by Sumiya, Yosuke, Kanagawa, Japan, for a “recording tape cartridge.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “Provided is a recording tape cartridge including: a case that is configured by causing a peripheral wall of an upper case and a peripheral wall of a lower case to abut against each other and accommodates a reel on which a recording tape is wound, a reference surface that is formed on the lower case and serves as a reference in an axial direction of the reel in a case where the case is loaded into a drive device, a noncontact communication medium on which individual information is recorded, the noncontact communication medium being accommodated in the lower case and having a plate shape, a supporting portion that is formed on the lower case and supports the noncontact communication medium such that the noncontact communication medium is disposed while being inclined with respect to the reference surface at an angle of approximately 45 degrees, a position restricting portion that is formed on the lower case and restricts a position of a lower end portion of the noncontact communication medium, and a retaining portion that is formed on the lower case and retains an upper end portion of the noncontact communication medium.”

The patent application was filed on March 11, 2021 (17/198,253).