FujiFilm Assigned Eleven Patents

Recording tape cartridge
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11521652) 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 accommodates a reel on which a recording tape is wound and includes a reference surface that serves as a reference in an axial direction of the reel in a case where the case is loaded into a drive device, noncontact communication mediums on which individual information is recorded, the noncontact communication mediums being accommodated in the case in a where at least two noncontact communication mediums overlap each other and having a plate shape, and a supporting portion that is formed in the case and supports the noncontact communication mediums such that the noncontact communication mediums are disposed while being inclined with respect to the reference surface at an angle of approximately 45 degrees.”

The patent application was filed on 2021-03-11 (17/198254).

Magnetic tape and device
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11514943) developed by Kasada, Norihito, 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 non-magnetic support, a non-magnetic layer including a non-magnetic powder and a binding agent on the non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.”

The patent application was filed on 2019-03-22 (16/361797).

Magnetic tape and device
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11514944) developed by Kasada, Norihito, 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 non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.”

The patent application was filed on 2019-03-22 (16/361814).

Magnetic tape having characterized magnetic layer, tape cartridge, and apparatus
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11508408) developed by Kurokawa, Takuto, Sano, Naoki, and Kasada, Norihito, Minami-ashigara, Japan, for “magnetic tape having characterized magnetic layer, 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 in which a difference (S.sub.0.1−S.sub.1.6) between a spacing S.sub.0.1 and a spacing S.sub.1.6 obtained after n-hexane cleaning on a surface of the magnetic layer is equal to or less than 32 nm. The S.sub.0.1 is a value obtained as a spacing under a pressing force of 0.1 atm from a relational expression between a pressure and a spacing obtained by performing a spacing measurement on the surface of the magnetic layer by an optical interference method under a pressing force of each of a plurality of different pressures after the n-hexane cleaning, and S.sub.1.6 is a spacing measured on the surface of the magnetic layer by the optical interference method under the pressing force of 1.6 atm after the n-hexane cleaning.”

The patent application was filed on 2021-01-28 (17/160535).

Magnetic tape having characterized magnetic layer and magnetic recording and reproducing device
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11501799) developed by Hosoda, Hidemasa, Kurokawa, Takuto, Kasada, Norihito, and Iwamoto, Takahiro, 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: “Provided are a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support, in which the magnetic layer contains an oxide abrasive, an average particle diameter of the oxide abrasive obtained from a secondary ion image acquired by irradiating a surface of the magnetic layer with a focused ion beam is greater than 0.08 μm and 0.14 μm or smaller, and an absolute value ΔN of a difference between a refractive index Nxy measured with respect to an in-plane direction of the magnetic layer and a refractive index Nz measured with respect to a thickness direction of the magnetic layer is 0.25 to 0.40, and a magnetic recording and reproducing device including the magnetic tape.”

The patent application was filed on 2020-03-27 (16/832788).

Magnetic tape cartridge and apparatus
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11495246) developed by Kasada, Norihito, and Sumiya, Yosuke, Minami-ashigara, Japan, for “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 cartridge includes a magnetic tape that is accommodated in the magnetic tape cartridge while being wound around a reel hub. The magnetic tape has a non-magnetic support and a magnetic layer including ferromagnetic powder, and includes one or more components selected from the group consisting of a fatty acid and a fatty acid amide in a portion on the magnetic layer side on the non-magnetic support, and after the magnetic tape cartridge is stored in an environment of an atmosphere temperature of 60° C. and a relative humidity of 80% for 24 hours, 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 at a photoelectron take-off angle of 10 degrees on a surface of the magnetic layer in an inner region during winding of the magnetic tape is 45 at % or more.”

The patent application was filed on 2021-01-28 (17/160534).

Signal processing, magnetic tape cartridge, magnetic tape reading apparatus, processing method of signal processing device, operation method of magnetic tape reading apparatus, and non-transitory computer-readable storage medium
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11495248) developed by Musha, Atsushi, Kanagawa, Japan, Okamoto, Yoshihiro, Nakamura, Yasuaki, and Nishikawa, Madoka, Ehime, Japan, for “signal processing device, magnetic tape cartridge, magnetic tape reading apparatus, processing method of signal processing device, operation method of magnetic tape reading apparatus, and non-transitory computer-readable storage medium.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A signal processing device includes a receiver that receives a plurality of playback signal sequence obtained by digitizing a plurality of reading results by a plurality of A/D converter, the plurality of reading results being obtained by reading data by a plurality of reading elements from a magnetic tape and a plurality of equalizers that perform waveform equalization of the plurality of playback signal sequence. The plurality of equalizers perform the waveform equalization by using a plurality of non-linear filters that have been learned to reduce distortion that occurs non-linearly in the plurality of playback signal sequence according to a condition under an environment in which the data is read from the magnetic tape. The plurality of non-linear filters being optimized to a suitable characteristic for the plurality of reading elements by optimization based on the plurality of reading results.”

The patent application was filed on 2021-06-22 (17/353820).

Magnetic tape, cartridge, and apparatus
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11488628) developed by Kasada, Norihito, 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, a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support, and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or smaller than 3.0, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape.”

The patent application was filed on 2019-07-26 (16/522806).

Magnetic tape, cartridge, and apparatus
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11482249) developed by Kasada, Norihito, Murata, Yuto, and Kaneko, Yusuke, 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: “A magnetic tape in which a minimum value of TDStens among five TDStens measured respectively at a temperature of 16° C. and a relative humidity of 20%, a temperature of 16° C. and a relative humidity of 80%, a temperature of 26° C. and a relative humidity of 80%, a temperature of 32° C. and a relative humidity of 20% and a temperature of 32° C. and a relative humidity of 55% is 1.43 μm/N or more, a ratio of a change of TDStens to a change of a relative humidity obtained from the five TDStens is 0.005 μm/N/% or less, and a ratio of a change of TDStens to a change of a temperature obtained from the five TDStens is 0.020 μm/N/° C. or less.”

The patent application was filed on 2020-12-22 (17/130857).

Magnetic tape having characterized magnetic layer, cartridge, and apparatus
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11468911) developed by Iwamoto, Takahiro, and Kasada, Norihito, 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, a non-magnetic layer including a non-magnetic powder and a binding agent on the non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5, the magnetic layer includes an oxide abrasive, 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 μm to 0.08 μm.”

The patent application was filed on 2019-10-21 (16/658565).

Magnetic tape having characterized magnetic layer and magnetic recording and reproducing device
Fujifilm Corporation, Tokyo, Japan, has been assigned a patent (11462242) developed by Iwamoto, Takahiro, Hosoda, Hidemasa, Kasada, Norihito, and Kurokawa, Takuto, 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: “Provided are a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support, in which the magnetic layer contains an oxide abrasive, an average particle diameter of the oxide abrasive obtained from a secondary ion image acquired by irradiating a surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and an absolute value ΔN of a difference between a refractive index Nxy measured with respect to an in-plane direction of the magnetic layer and a refractive index Nz measured with respect to a thickness direction of the magnetic layer is 0.25 to 0.40, and a magnetic recording and reproducing device including the magnetic tape.”

The patent application was filed on 2021-05-21 (17/326458).