FujiFilm Assigned Six Patents

Magnetic tape device, head tracking servo
FujiFilm Corporation, Minato-ku, Tokyo, Japan, has been assigned a patent (10,134,433) developed by Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape device, magnetic reproducing method, and head tracking servo method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “Provided is a magnetic tape device in which a magnetic tape transportation speed is equal to or lower than 18 m/sec, Ra measured regarding a surface of a magnetic layer of a magnetic tape is equal to or smaller than 2.0 nm, 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 %, and .DELTA.SFD, =SFD.sub.25.degree. C.-SFD.sub.-190.degree. C.) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50, with the SFD.sub.25.degree. C. being SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25.degree. C., and the SFD.sub.-190.degree. C. being SFD measured at a temperature of -190.degree. C.”

The patent application was filed on March 14, 2018 (15/920,782).

Magnetic recording medium for microwave assisted recording
FujiFilm Corporation, Minato-ku, Tokyo, Japan, has been assigned a patent (10,115,425) developed by Shimizu, Osamu, and Mikami, Tatsuo, Minami-ashigara, Japan, for “magnetic recording medium for microwave assisted recording and magnetic recording device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “Provided is a coating-type magnetic recording medium for microwave assisted recording. A magnetic recording medium for microwave assisted recording having a magnetic layer including ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer exhibits an intrinsic ferromagnetic resonance frequency of 30.0 GHz or more. A magnetic recording device including the magnetic recording medium and a magnetic head for microwave assisted recording.”

The patent application was filed on April 27, 2017 (15/498,732).

Manufacturing hexagonal ferrite powder, hexagonal ferrite powder, and magnetic recording medium
FujiFilm Corporation, Minato-ku, Tokyo, Japan, has been assigned a patent (10,102,874) developed by Shirata, Masashi, Minami-ashigara-shi, Japan, for “method of manufacturing hexagonal ferrite powder, hexagonal ferrite powder, and magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “An aspect of the present invention relates to A method of manufacturing hexagonal ferrite powder, which comprises heating to equal to or higher than 300.degree. C. and pressurizing to equal to or higher than 20 MPa a hexagonal ferrite precursor-containing water-based solution, to convert the precursor to hexagonal ferrite, wherein the water-based solution comprises at least a reducing compound selected from the group consisting of a reducing inorganic compound and a reducing organic compound that have a reducing property and exist as a solid or a liquid at ordinary temperature and ordinary pressure, as well as, when the reducing compound is a reducing inorganic compound, the water-based solution further comprises an organic compound.”

The patent application was filed on March 27, 2015 (14/671,125).

Binder for magnetic recording medium
FujiFilm Corporation, Minato-ku, Tokyo, Japan, has been assigned a patent (10,090,013) developed by Omura, Kazufumi, Minami-ashigara, Japan, for “binder for magnetic recording medium and method of manufacturing the same, composition for magnetic recording medium, and magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “An aspect of the present invention relates to binder for a magnetic recording medium, which is vinyl chloride resin comprising at least one side chain, the side chain comprising at least one urethane bond and at least one monovalent sulfur-containing substituent denoted by formula, (1): –S-A-Z, 1) wherein, in formula, 1, A denotes a divalent connecting group which may comprise one or more active hydrogen groups and Z denotes an active hydrogen group.”

The patent application was filed on March 27, 2015 (14/670,795).

Composition for magnetic recording medium
FujiFilm Corporation, Minato-ku, Tokyo, Japan, has been assigned a patent (10,081,701) developed by Aoshima, Toshihide, and Katayama, Kazutoshi, Minami-ashigara, Japan, for “composition for magnetic recording medium and magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “An aspect of the present invention relates to a composition, which is a composition for a magnetic recording medium and comprises an isocyanate compound in the form of an adduct of a polyhydroxyl compound having one or more aromatic carbon rings and three or more hydroxyl groups per molecule with a polyisocyanate having two or more isocyanate groups per molecule.”

The patent application was filed on August 29, 2014 (14/472,663).

Magnetic tape
FujiFilm Corporation, Minato-ku, Tokyo, Japan, has been assigned a patent (10,074,393) 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 June 7, 2017 (15/615,871).