Patents by Inventor Toshiro Takahashi
Toshiro Takahashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4925738Abstract: A substrate for a magnetic disk, having an anodized aluminum coating layer with pores widened by chemical dissolution so that the total area of pores is from 20 to 80% of the entire surface area.Type: GrantFiled: September 28, 1988Date of Patent: May 15, 1990Inventors: Noboru Tsuya, Tadao Tokushima, Toshiro Takahashi
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Patent number: 4879204Abstract: A silver halide photographic material is described, comprising a support having formed thereon at least one silver halide emulsion layer and at least one light-insensitive hydrophilic colloid layer, wherein at least one of layers consisting of said at least one silver halide emulsion layer and said at least one light-insensitive hydrophilic colloid layer contains a hydrazine derivative, and wherein at least one of said at least one light-insensitive hydrophilic colloid layer that is formed on the uppermost silver halide emulsion layer contains a dye.Type: GrantFiled: August 16, 1988Date of Patent: November 7, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Kunio Ishigaki, Toshiro Takahashi, Yuji Mihara, Keiichi Adachi, Shigeru Ohno, Masahiro Okada, Naomi Saeki
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Patent number: 4847180Abstract: A silver halide photographic material which may be handled in a bright room, which comprises a support having provided thereon at least one silver halide emulsion layer containing silver chlorobromide grains (bromide content: not more than 20 mol %) or silver chloride grains, said emulsion layer containing 1.times.10.sup.-7 mol to 5.times.10.sup.-4 mol of a rhodium salt per mol of silver, and said emulsion layer or at least one other hydrophilic colloid layer containing at least one hydrazine derivative represented by the following general formula (I): ##STR1## wherein R represents an organic group having 1 to 30 carbon atoms; A represents a substituted or unsubstituted phenylene group or a substituted or unsubstituted naphthylene group; X represents --NH--or --O--; L.sub.Type: GrantFiled: May 1, 1987Date of Patent: July 11, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Junji Miyata, Ken-ichi Kuwabara, Toshiro Takahashi, Yoshio Inagaki, Shigeo Hirano
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Patent number: 4830950Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer; wherein said emulsion layer comprises a silver chloride emulsion or a silver chlorobromide emulsion containing 90 mol % or more silver chloride, which is prepared in the presence of a water-soluble rhodium salt in an amount of 1.times.10.sup.-7 to 2.times.10.sup.-5 mol per mol of silver halide; and wherein at least one of said emulsion layer and hydrophilic colloidal layers of said material contains a dye compound represented by formula (I) ##STR1## wherein: R.sub.1 represents an alkyl group, an alkoxy group, a hydroxy group, an amino group, a substituted amino group, an alkoxycarbonyl group, a carboxy group, a cyano group, a carbamoyl group, a sulfamoyl group, an ureido group, a thioureido group, an acylamido group, a sulfonamido group or a phenyl group, Q represents a sulfoalkyl group, a sulfoalkoxyalkyl group, or an aryl group having at least one sulfo group; R.sub.Type: GrantFiled: January 14, 1987Date of Patent: May 16, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Kenichi Kuwabara, Toshiro Takahashi, Keiichi Adachi, Masahiro Okada
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Patent number: 4818659Abstract: A silver halide photographic material for use in a bright room is disclosed comprising a support having thereon at least two silver halide emulsion layers, each of the emulsion layers having a different sensitivity and comprising silver chloride grains or silver chlorobromide grains having at least about 80 mol % silver chloride, each of the silver halide emulsions layers containing from about 1.times.10.sup.-7 mol to about 1.times.10.sup.-4 mol of a rhodium salt per mol of silver, wherein the sensitivity of the lower emulsion layer (the emulsion layer coated nearer to the support) is higher than the sensitivity of the upper emulsion layer (the emulsion layer coated farther from the support) and at least one of the silver halide emulsion layers or different hydrophilic colloid layers contains a hydrazine derivative and at least one of the silver halide emulsion layers of different hydrophilic colloid layers contains a dry compound having a .sup..lambda. max of from about 400 nm to about 550 nm.Type: GrantFiled: April 7, 1987Date of Patent: April 4, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshiro Takahashi, Ken-ichi Kuwabara, Kimitaka Kameoka, Masahiro Okada
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Patent number: 4803149Abstract: A silver halide photographic material for a bright room and a process for producing the photographic material are disclosed, wherein the silver halide photographic material for a bright room comprises a support having thereon at least one silver halide emulsion layer containing silver chloride grains or silver chlorobromide grains containing at least 80 mol % silver chloride, at least one of said silver halide emulsion layer or another hydrophilic colloid layer(s) present containing a yellow dye making the silver halide photographic material substantially insensitive to visible light of 420 n.m. or more and an ultraviolet absorbent in an amount sufficient to reduce the specific sensitivity of the silver halide emulsion at 360 n.m. to 1/2 or lower than 1/2 thereof in the absence of the ultraviolet absorbent, and the .gamma. value of the silver halide photographic material being at least 10.Type: GrantFiled: October 6, 1986Date of Patent: February 7, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshiro Takahashi, Ken-ichi Kuwabara, Masahiro Okada
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Silver halide photographic material and very high contrast negative image-forming process using same
Patent number: 4789618Abstract: A silver halide photographic material having on a support at least one silver halide emulsion layer is disclosed, wherein the silver halide emulsion layer comprises a silver halide emulsion containing an oxidizing agent added thereto before chemical ripening of the emulsion, and the silver halide emulsion or a hydrophilic colloid layer contains a hydrazine derivative.Type: GrantFiled: May 7, 1986Date of Patent: December 6, 1988Assignee: Fuji Photo Film Co., Ltd.Inventors: Nobuaki Inoue, Senzo Sasaoka, Toshiro Takahashi -
Patent number: 4762769Abstract: A silver halide photographic material which has at least one silver halide emulsion layer comprising silver chloride or silver chlorobromide grains which has a bromide content of 5 mol % or less, and containing a rhodium salt in an amount of from 1.times.10.sup.-6 to 5.times.10.sup.-4 mole per mole of silver in said layer, and contains both a hydrazine derivative and a dye having an absorption peak in the wavelength region of from 400 nm to 550 nm in at least one of said emulsion layer another hydrophilic colloid layer, to thereby control the ratio of sensitivity at 360 nm to sensitivity at 400 nm (S.sub.360 /S.sub.400 ratio) to not less than 30, thereby achieving ultra-high contrast, high sensitivity, and a satisfactory aptitude for safelight.Type: GrantFiled: September 22, 1986Date of Patent: August 9, 1988Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshiro Takahashi, Ken-ichi Kuwabara, Masahiro Okada
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Patent number: 4740453Abstract: A silver halide photosensitive material is described, comprising a support and at least one silver halide emulsion layer, wherein said emulsion layer or another layer contains a compound represented by formula (I) ##STR1## wherein X represents an atomic group forming a redox center of benzene type having substituents by linking with C.sub.A and C.sub.B, and which does not enable Time-PUG to be released until the redox center is oxidized during development processing; EWG represents an electron withdrawing group having a Hammet's .sigma. para value exceeding 0.3; C.sub.A and C.sub.B each represents a carbon atom; R.sub.1 and R.sub.2 each represents a hydrogen atom or a suitable substituent; Time represents a timing group connecting to C.sub.B through a sulfur, nitrogen, or selenium atom thereof, t is an integer of 0 or 1, and when t=0, Time is a chemical bond; PUG represents a photographically useful group and connects to C.sub.Type: GrantFiled: December 24, 1985Date of Patent: April 26, 1988Assignee: Fuji Photo Film Co., Ltd.Inventors: Koki Nakamura, Shigeo Hirano, Tadashi Ikeda, Keiji Mihayashi, Mitsunori Ono, Toshiro Takahashi, Ken-ichi Kuwabara, Morio Yagihara, Isamu Itoh
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Patent number: 4737452Abstract: A silver halide photographic material comprising a support having at least one silver halide emulsion layer containing substantially surface latent image type silver halide grains, said emulsion layer or at least one hydrophilic colloid layer adjacent to the emulsion layer containing a compound represented by general formula (III): ##STR1## wherein L.sub.2 represents --CONR--, --SO.sub.2 NR-- or --NRCONR' and Z, L.sub.1, m, Ro, R.sub.1 and M are as herein described. The silver halide photographic material is capable of having high contrast negative images, high sensitive negative images, and good dot images.Type: GrantFiled: November 12, 1986Date of Patent: April 12, 1988Assignee: Fuji Photo Film Co., Ltd.Inventors: Kimitaka Kameoka, Nobuaki Inoue, Yoshio Inagaki, Hidetoshi Kobayashi, Toshiro Takahashi
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Patent number: 4699873Abstract: A negative silver halide photographic light-sensitive material comprising a support having provided thereon at least one silver halide emulsion layer is disclosed. At least one of the silver halide emulsion layers or another hydrophilic colloidal layer of the material contains a hydrazine derivative and a compound represented by the formula:R.sub.1 --S--S--R.sub.2wherein R.sub.1 and R.sub.2, which may be the same or different, each represents an aliphatic group, an aromatic group or a heterocyclic group, or when R.sub.1 and R.sub.2 are both aliphatic groups they may together form a ring. The material can rapidly form a superhigh contrast image using a stable processing solution.Type: GrantFiled: January 29, 1986Date of Patent: October 13, 1987Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshiro Takahashi, Shigeo Hirano
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Patent number: 4681669Abstract: In production of magnetic recording media by anode oxidation of an Al predominant substrate, deposition of ferromagnetic substance in substrate pores and final grinding, use of a substrate having a surface K-value of 0.5 or larger enables easy production of media with surface roughness well suited for ideal high density magnetic recording. The K-value is the ratio of X-ray reflection intensity of the crystal plane S(1,1,1) and the toal X-ray reflection intensity of all crystal planes.Type: GrantFiled: November 14, 1985Date of Patent: July 21, 1987Assignee: Nippon Gakki Seizo Kabushiki KaishaInventors: Toshiro Takahashi, Tadao Tokushima, Yoshifumi Suzuki, Yukio Wakui
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Patent number: 4680540Abstract: A synchronizing gate signal is generated in synchronism with an input signal or a clock signal, and first and second gates are opened by the synchronizing gate signal. The input signal having passed through the first gate is counted by a first counter circuit, and the clock signal having passed through the second gate is frequency-divided by a divide-by-10.sup.n frequency divider. An output from the frequency divider is counted by a second counter means. The synchronizing gate signal is generated under the control of a control circuit, and is prevented from being generated when the output from the frequency divider is applied to the control circuit. The n in the frequency-division ratio 1/10.sup.n of the frequency divider and a maximum count P of a third counter circuit are determined from a count of the third counter circuit, a preset measurement accuracy, and a period of the clock signal at the time one output is produced from the frequency divider, the n being set in the frequency divider.Type: GrantFiled: July 11, 1984Date of Patent: July 14, 1987Assignee: Takeda Riken Kogyo KabushikikaishaInventors: Shoji Niki, Toshiro Takahashi, Yohei Hirakoso
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Patent number: 4650708Abstract: In production of a magnetic recording material which accumulates information in magnetic substance packed in micro pores extending in the thickness direction of an anodic oxide surface layer formed on an aluminum foil by anodic oxidation and electrolylic deposition, ferromagnetic substance such as Fe--Co--Ni alloys is used for packing and the pore diameter is adjusted to a range from 40 to 100 nm in order to obtain highly improved magnetic characteristics which enable high density magnetic recording.Type: GrantFiled: May 22, 1984Date of Patent: March 17, 1987Inventor: Toshiro Takahashi
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Patent number: 4636456Abstract: A process for forming photographic image is disclosed, comprising photographically developing, in the presence of a polyalkylene oxide compound, a silver halide photographic light-sensitive material including at least one silver halide emulsion layer and containing in at least said emulsion layer or other hydrophilic layer a compound represented by formula (I). ##STR1## wherein: A and A' each represents a hydrogen atom or an alkalihydrolyzable group;R.sub.1, R.sub.2, and R.sub.3 each represents a group capable of substituting a hydrogen atom on the hydroquinone nucleus, with R.sub.2 and R.sub.3, A and R.sub.1, or A and R.sub.2 together form a ring; andX represents a group which shows a development-inhibiting effect after being released.Type: GrantFiled: May 7, 1985Date of Patent: January 13, 1987Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshiro Takahashi, Koki Nakamura
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Patent number: 4518682Abstract: A silver halide photographic light-sensitive material is disclosed. The material has improved sensitivity and granularity as well as an increased gradient. Further, the material can be processed by rapid processing methods. The material is comprised of a support having positioned thereon a light-sensitive silver halide emulsion layer and a compound represented by the general formula (I):A-B (I)wherein A is residue of a compound capable of undergoing a coupling reaction with an oxidized primary amine developer, the residue being derived by eliminating a hydrogen atom from an active position of the compound. B is a group capable of being released through a coupling reaction to exert a fogging effect.Type: GrantFiled: September 15, 1983Date of Patent: May 21, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Hidetoshi Kobayashi, Toshiro Takahashi, Shigeo Hirano, Takeshi Hirose, Keiichi Adachi
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Patent number: 4468614Abstract: An average frequency measuring apparatus in which auxiliary gate signals are converted into synchronized gate signals synchronized with either input signals or clock signals; first and second gates are opened by the synchronized gate signals; the input signals and the clock signals having passed through the first and second gates are counted by first and second counters, respectively; and the frequency of the input signals is calculated from the count values of the first and second counters for a plurality of occurrences of the synchronized gate signal. A third counter is provided for counting the number of the synchronized gate signals, and a minimum counting time is calculated by calculating means from the count values of the third and second counters and the set measurement accuracy.Type: GrantFiled: May 14, 1982Date of Patent: August 28, 1984Assignee: Takeda Riken Kogyo Kabushiki KaishaInventors: Toshiro Takahashi, Shoji Niki
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Patent number: 4184927Abstract: Workpieces vertically suspended on carrier bars in side-by-side relation are dipped into an electrolyte bath which has a plurality of electric contact plates of alternating polarity spaced along one side. Electric energy is applied to the workpieces from the plates through the carrier bars and the successive work pieces serve as electrodes of opposite polarity, the polarities reversing as the individual carrier bars are advanced from plate to plate.Type: GrantFiled: December 29, 1977Date of Patent: January 22, 1980Assignee: Riken Keikinzoku Kogyo Kabushiki KaishaInventors: Toshiro Takahashi, Masashi Ikegaya
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Patent number: 4144142Abstract: A method for inexpensively producing a colored anodized film on aluminum or aluminum alloy material by electrolyzing the aluminum material in a sulphuric acid bath in the presence of a resistivity agent selected from trivalent aluminum ions and oxalic acid, by applying thereto a pulsating electric current having a peak voltage of 25 to 45 volts and a pulse duration of 5 to 70 milliseconds (m.sec.) and a ratio of pulse frequency to pulse duration of between 2 and 7.Type: GrantFiled: December 5, 1977Date of Patent: March 13, 1979Assignee: Riken Keikinzoku Kogyo Kabushiki KaishaInventors: Toshiro Takahashi, Masashi Ikegaya, Masamichi Ozaki
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Patent number: 4117703Abstract: Aluminum or aluminum alloy scraps or wastes are broken into chips and extruded under a high temperature to produce extruded structural profiles. The method is characterized by the fact that the interior of the extruder is evacuated prior to or simultaneously with the extrusion step so as to exhaust air entrapped in the body of the chips. There is also disclosed apparatus suitable for performing the method.Type: GrantFiled: May 31, 1977Date of Patent: October 3, 1978Assignee: Riken Keikinzoku Kogyo Kabushiki KaishaInventors: Toshiro Takahashi, Toshihiro Nagano, Shozo Iguchi, Masaru Kikuchi, Katsuhiko Nakamura, Atsushi Mochizuki