Lippmann Patents (Class 430/948)
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Patent number: 6265143Abstract: A photographic material comprising a Lippmann emulsion coated on a polycarbonate support is disclosed. The product is suited for new industrial applications under severe conditions of temperature and humidity.Type: GrantFiled: October 13, 1999Date of Patent: July 24, 2001Assignee: Agfa-GevaertInventors: Eric René Janssens, Gustaaf Joannes Peeters
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Patent number: 5523200Abstract: The invention generally relates to a method of silver halide grain finishing comprising providing a high chloride silver halide grain emulsion and adding a silver bromide fine grain Lippmann emulsion during the chemical sensitization heat cycle for each grain wherein said fine grain emulsion has a photographically useful compound adhered to said fine grain Lippmann emulsion.Type: GrantFiled: February 17, 1995Date of Patent: June 4, 1996Assignee: Eastman Kodak CompanyInventors: Paul T. Hahm, Walter H. Isaac, Heinz E. Stapelfeldt
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Patent number: 5085909Abstract: Squarylium compounds having the following formula (I), ##STR1## and an optical information recording medium comprising a substrate, and a recording layer formed on the substrate, comprising a squarylium compound having formula (II) are disclosed: ##STR2##Type: GrantFiled: March 16, 1990Date of Patent: February 4, 1992Assignees: Ricoh Company, Ltd., Kyowa Hakko Kogyo Co., Ltd.Inventors: Tsutomu Satoh, Ikuo Shimizu, Yukiyoshi Ito
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Patent number: 4978603Abstract: An image-forming process which comprises after imagewise exposing a silver halide photographic material having at least one silver halide emulsion layer composed of silver halide grains containing at least 1.times.10.sup.-6 mol of a rhodium salt per mol of silver and having a mean grain size of not larger than 0.15 .mu.m with a developer meeting the following conditions (a) to (d);(a) the developer substantially contains dihydroxybenzene only as the developing agent,(b) the developer contains at least 0.18 mol/liter of a free sulfite,(c) pH thereof is at least 10.5, and(d) the developer contains at least 20 mg/liter of a compound represented by formula (I): ##STR1## wherein X.sub.1 represents a hydrogen atom or a nitro group and X.sub.2 and X.sub.3 each represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms.Type: GrantFiled: December 14, 1988Date of Patent: December 18, 1990Assignee: Fuji Photo Film Co., Ltd.Inventors: Nobuaki Inoue, Morio Yagihara, Yoshihiro Takagi
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Patent number: 4804599Abstract: Dyes of the formula ##STR1## wherein Y completes a benzothiazole or benzoselenazole nucleus, R.sub.1 is alkyl, R.sub.2 and R.sub.3 are hydrogen, alkyl or phenyl and Z is alkylene, are suitable for sensitizing fine grain silver halide emulsions.Type: GrantFiled: May 24, 1988Date of Patent: February 14, 1989Assignee: Ciba-Geigy AGInventor: Geoffrey E. Ficken
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Patent number: 4786587Abstract: A silver halide photographic material comprising at least one negative type silver halide emulsion layer coated on a support, said emulsion comprising two kinds of monodisperse emulsions each having a means grain sizes of not more than 0.5 micron and, differing in mean grain size from each other at least by 0.1 micron, and said photographic material further comprising a hydrazine derivative in at least one photographic layer, whereby negative images of high density and very high contrast can be obtained with a high photographic speed and without black spots.Type: GrantFiled: October 26, 1987Date of Patent: November 22, 1988Assignee: Fuji Photo Film Co., Ltd.Inventor: Ken-ichi Kuwabara
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Patent number: 4451560Abstract: A method for forming a photosensitive element which comprises contacting silver halide in a plurality of spaced depressions in a surface with a mixture of a silver halide solvent and preformed sensitivity centers.Type: GrantFiled: November 15, 1982Date of Patent: May 29, 1984Assignee: Polaroid CorporationInventors: Arthur M. Gerber, Judith Loucks
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Patent number: 4386143Abstract: A low priced multicolor optical filter having optical black and a process for producing the same are disclosed; the filter comprising a base having thereon one black-and-white silver halide emulsion layer in which at least two color dye patterns and at least one optical black area comprising silver or silver and a dye are formed.Type: GrantFiled: November 26, 1980Date of Patent: May 31, 1983Inventors: Masamichi Sato, Kenji Matsumoto
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Patent number: 4359526Abstract: A method for forming a photosensitive element comprising a plurality of single effective silver halide grains in a predetermined spaced array which comprises coalescing a fine-grain silver halide emulsion in a plurality of predetermined spaced depressions in a surface, wherein said coalescence is carried out by contacting said fine-grain emulsion with a silver halide solvent in the vapor phase.Type: GrantFiled: September 2, 1981Date of Patent: November 16, 1982Assignee: Polaroid CorporationInventor: Vivian K. Walworth
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Patent number: 4353977Abstract: A photosensitive silver halide element comprising a support carrying photosensitive silver halide grains in a predetermined spaced array is prepared by a method which comprises at least partially coalescing fine-grain silver halide in a plurality of spaced depressions in a hydrophobic layer, superposing said layer with a hydrophilic layer during or subsequent to said coalescence, and then separating said hydrophilic layer and said hydrophobic layer whereby said coalesced silver halide grains are retained on said hydrophilic layer in a pattern corresponding substantially to the pattern of said spaced depressions.Type: GrantFiled: September 2, 1981Date of Patent: October 12, 1982Assignee: Polaroid CorporationInventors: Arthur M. Gerber, Warren D. Slafer, Vivian K. Walworth
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Patent number: 4352874Abstract: A fine-grain emulsion in a plurality of predetermined spaced depressions is coalesced to form, in situ, a plurality of single effective silver halide grains in a predetermined spaced array by the action of a solution of a silver halide solvent containing a dissolved silver salt.Type: GrantFiled: September 2, 1981Date of Patent: October 5, 1982Assignee: Polaroid CorporationInventors: Edwin H. Land, Vivian K. Walworth
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Patent number: 4271246Abstract: A method for producing a multicolor optical filter, which comprises exposing a photographic material comprising a support and at least one black-and-white silver halide emulsion layer to light through a first pattern; developing the exposed emulsion layer with a first coupler-containing color developer to form a pattern of a first dye; then exposing an unexposed portion of said emulsion layer to light through a second pattern; developing the exposed area with a second coupler-containing color developer to form a pattern of a second dye; optionally repeating exposure and development to form patterns containing dyes of third and subsequent colors, thereby to form color patterns of at least two colors; and subjecting the product to a silver removal treatment after the final color development step.Type: GrantFiled: June 28, 1979Date of Patent: June 2, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Masamichi Sato, Kenji Matsumoto
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Patent number: RE37719Abstract: A transparent substrate and a method of producing the same suitable especially for an optical system for an optical data recording medium using a linearly polarized light as a data reading light such as magneto-optical recording medium drive unit and an optical data recording medium for reading data using a linearly polarized light.Type: GrantFiled: June 21, 1994Date of Patent: May 28, 2002Inventors: Toshinori Sugiyama, Tetsurou Ikegaki, Mitsuru Shimizu, Yoshitane Tuburaya