US3155507A - Photographic processes - Google Patents

Photographic processes Download PDF

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Publication number
US3155507A
US3155507A US236420A US23642062A US3155507A US 3155507 A US3155507 A US 3155507A US 236420 A US236420 A US 236420A US 23642062 A US23642062 A US 23642062A US 3155507 A US3155507 A US 3155507A
Authority
US
United States
Prior art keywords
silver
silver halide
dispersion
sodium thiosulfate
organic compound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US236420A
Other languages
English (en)
Inventor
Blake Ralph Kingsley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL134365D priority Critical patent/NL134365C/xx
Priority to FR88737D priority patent/FR88737E/fr
Priority to FR89467D priority patent/FR89467E/fr
Priority to US236418A priority patent/US3155516A/en
Priority to US236417A priority patent/US3155515A/en
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US236420A priority patent/US3155507A/en
Priority to US236412A priority patent/US3155514A/en
Priority to DEP30723A priority patent/DE1226877B/de
Priority to GB46344/62A priority patent/GB1031902A/en
Priority to DEP30721A priority patent/DE1261397B/de
Priority to GB46345/62A priority patent/GB1031903A/en
Priority to US317824A priority patent/US3155519A/en
Priority claimed from NL6408533A external-priority patent/NL6408533A/xx
Priority to NL6408533A priority patent/NL6408533A/xx
Priority to DK395464A priority patent/DK119392B/da
Priority to BE651688A priority patent/BE651688A/fr
Priority to US388919A priority patent/US3418124A/en
Priority to US390460A priority patent/US3384485A/en
Priority to CH1270464A priority patent/CH486719A/de
Priority to US403661A priority patent/US3284206A/en
Publication of US3155507A publication Critical patent/US3155507A/en
Application granted granted Critical
Priority to GB34231/65A priority patent/GB1111226A/en
Priority to DEP37430A priority patent/DE1294186B/de
Priority to BE668111D priority patent/BE668111A/xx
Priority to DEP37479A priority patent/DE1293581B/de
Priority to GB43289/65A priority patent/GB1124772A/en
Priority to BE670823D priority patent/BE670823A/xx
Priority to DEP37856A priority patent/DE1293582B/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D263/00—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
    • C07D263/52—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings condensed with carbocyclic rings or ring systems
    • C07D263/54—Benzoxazoles; Hydrogenated benzoxazoles
    • C07D263/58—Benzoxazoles; Hydrogenated benzoxazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C391/00—Compounds containing selenium
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
    • C07D277/02—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings
    • C07D277/20—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D277/32—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
    • C07D277/60—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings condensed with carbocyclic rings or ring systems
    • C07D277/62—Benzothiazoles
    • C07D277/68—Benzothiazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D293/00—Heterocyclic compounds containing rings having nitrogen and selenium or nitrogen and tellurium, with or without oxygen or sulfur atoms, as the ring hetero atoms
    • C07D293/10—Heterocyclic compounds containing rings having nitrogen and selenium or nitrogen and tellurium, with or without oxygen or sulfur atoms, as the ring hetero atoms condensed with carbocyclic rings or ring systems
    • C07D293/12—Selenazoles; Hydrogenated selenazoles
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/492—Photosoluble emulsions

Definitions

  • direct positive images are formed by a process which comprises (a) Exposing, imagewise, to :actinic radiation a photosensitive layer oomprising silver halide crystals treated with the organic compound as described above,
  • the organic compound is present in the emulsions of this invention greater than fog inhibiting amounts, the later amounts being the maximum quantity vhich provides low fog without serious loss in speed.
  • Example I was repeated except that l-phenyl-S-mercaptotetrazole was substituted for the 2-mercapto-4- phenylthiazole of that example.
  • the pH of the treating solution was 3.5. The results were similar to those obtained with Example I.
  • This emulsion was applied at a coating weight of 46 mg. of silver per square decimeter on 0.004 inch thick polyester photographic film base as described in Example I.
  • the coating after imagewise exposure, showed a greater rate of fixing in a 1.0 N (0.5 molar) aqueous sodium thiosulfate in exposed areas than in the unexposed areas so as to form a positive silver halide image.
  • a reducing agent a conventional photographic developing solution containing 1- phenyl-4-methyl-3-pyrazolidone and hydroquinone
  • EXAMPLE XV A silver bromide emulsion was prepared by adding one mole of 1.5 N AgNO to 1.2 moles of a solution of 0.7 N KBr containing 33 g. of gelatin. After ripening 10 minutes at 130 F. the emulsion was coagulated by the addition of a 12% aqueous solution of a water-soluble, acid-soluble partial acetal of polyvinyl alcohol and o-sulfobenzaldehyde and consisting of 5 g. of suifonate surfur per g. of polymer, followed by the addition of sulfuric acid to lower the pH to 2.6. An aqueous solution containing 7.2 g.
  • EXAMPLE XVI A silver chloride emulsion was prepared in the same manner as in Example XV except KCl was used instead of KBr at precipitation and redispersion. The KCl at precipitation was present in an amount of 1.08 moles per mole of silver nitrate. The curds were dispersed in 17% gelatin to give a total of 94 g. gelatin per mole of silver bromide. MPT (Z-mercapto 4 phenylthiazole) was added from a 1% ethanol solution to give a total of 1.0 g. per mole of silver chloride. The emulsion was adjusted to a final weight of 1950 g. with water after the addition of chrome alum as a hardening agent. The
  • a direct-positive image was formed by the and 40-second exposures, i.e., imagewise density decreased with increasing exposure. However, when the exposure was increased to 80 seconds, a negative image was formed, the system reversing or solarizing by increased exposure like conventional silver halide systems.
  • a process according to claim 1 wherein said silver halide crystals are silver chlorobromide crystals.
  • a process for the formation of photographic images comprising (a) exposing, imagewise, to actinic radiation a photographic element comprising, in the order stated, the sequential steps of a layer of a water-permeable organic colloid containing silver halide crystals rendered relatively less soluble in a silver halide solvent by treatment with an organic compound capable of forming a silver salt and whose silver salt is of lower solubility in water than silver chloride, and
  • said silver chlorobromide amount in terms of the ratio of its weight to the dispersion is treated with 10% by weight surface area of the silver halide crystals, that aqueous sodium thiosulfate, so that the resulting when admixed in such ratio with an aqueous mixture contains 0.29 mg. of Ag and 100 mg. silver chlorobromide dispersion, 70/30 mole perof sodium thiosulfate, at least three times the cent, gelatin emulsion containing 0.29 mg.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Thiazole And Isothizaole Compounds (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
US236420A 1961-12-08 1962-11-08 Photographic processes Expired - Lifetime US3155507A (en)

Priority Applications (26)

Application Number Priority Date Filing Date Title
FR89467D FR89467E (cs) 1961-12-08
NL134365D NL134365C (cs) 1961-12-08
FR88737D FR88737E (cs) 1961-12-08
US236417A US3155515A (en) 1961-12-08 1962-11-08 Photographic products
US236418A US3155516A (en) 1961-12-08 1962-11-08 Photographic products
US236420A US3155507A (en) 1961-12-08 1962-11-08 Photographic processes
US236412A US3155514A (en) 1961-12-08 1962-11-08 Photographic compositions and elements
DEP30723A DE1226877B (de) 1961-12-08 1962-12-07 Photographische Silberhalogenidemulsion
GB46344/62A GB1031902A (en) 1961-12-08 1962-12-07 Improvements in silver halide photography
DEP30721A DE1261397B (de) 1961-12-08 1962-12-07 Photographisches Verfahren zur Herstellung positiver Bilder
GB46345/62A GB1031903A (en) 1961-12-08 1962-12-07 Photographic silver halide materials and processes
US317824A US3155519A (en) 1961-12-08 1963-10-21 Photographic compositions, layers and elements
NL6408533A NL6408533A (cs) 1961-12-08 1964-07-24
BE651688A BE651688A (cs) 1961-12-08 1964-08-11
DK395464A DK119392B (da) 1961-12-08 1964-08-11 Fotografisk sølvhalogenidmateriale til kopiering.
US388919A US3418124A (en) 1961-12-08 1964-08-11 High contrast direct positive by using active cations in silver halide solvent
US390460A US3384485A (en) 1961-12-08 1964-08-18 Silver halide emulsions photosolubilized with optical sensitizing dyes and silver mercaptides
CH1270464A CH486719A (de) 1961-12-08 1964-09-30 Photographische Halogensilberemulsion und ihre Verwendung
US403661A US3284206A (en) 1961-12-08 1964-10-13 Image yielding layers
BE668111D BE668111A (cs) 1961-12-08 1965-08-10
GB34231/65A GB1111226A (en) 1961-12-08 1965-08-10 Improvements relating to the production of images
DEP37430A DE1294186B (de) 1961-12-08 1965-08-10 Photographisches Verfahren zur Herstellung positiver Bilder
DEP37479A DE1293581B (de) 1961-12-08 1965-08-18 Photographische Silberhalogenidemulsion
GB43289/65A GB1124772A (en) 1961-12-08 1965-10-12 Improvements in silver halide photography
BE670823D BE670823A (cs) 1961-12-08 1965-10-12
DEP37856A DE1293582B (de) 1961-12-08 1965-10-13 Photographische Silberhalogenidemulsion

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
US15813261A 1961-12-08 1961-12-08
US236417A US3155515A (en) 1961-12-08 1962-11-08 Photographic products
US236412A US3155514A (en) 1961-12-08 1962-11-08 Photographic compositions and elements
US236420A US3155507A (en) 1961-12-08 1962-11-08 Photographic processes
US236418A US3155516A (en) 1961-12-08 1962-11-08 Photographic products
US317824A US3155519A (en) 1961-12-08 1963-10-21 Photographic compositions, layers and elements
NL6408533A NL6408533A (cs) 1961-12-08 1964-07-24
US388919A US3418124A (en) 1961-12-08 1964-08-11 High contrast direct positive by using active cations in silver halide solvent
US390460A US3384485A (en) 1961-12-08 1964-08-18 Silver halide emulsions photosolubilized with optical sensitizing dyes and silver mercaptides
US403661A US3284206A (en) 1961-12-08 1964-10-13 Image yielding layers

Publications (1)

Publication Number Publication Date
US3155507A true US3155507A (en) 1964-11-03

Family

ID=27580572

Family Applications (8)

Application Number Title Priority Date Filing Date
US236412A Expired - Lifetime US3155514A (en) 1961-12-08 1962-11-08 Photographic compositions and elements
US236417A Expired - Lifetime US3155515A (en) 1961-12-08 1962-11-08 Photographic products
US236420A Expired - Lifetime US3155507A (en) 1961-12-08 1962-11-08 Photographic processes
US236418A Expired - Lifetime US3155516A (en) 1961-12-08 1962-11-08 Photographic products
US317824A Expired - Lifetime US3155519A (en) 1961-12-08 1963-10-21 Photographic compositions, layers and elements
US388919A Expired - Lifetime US3418124A (en) 1961-12-08 1964-08-11 High contrast direct positive by using active cations in silver halide solvent
US390460A Expired - Lifetime US3384485A (en) 1961-12-08 1964-08-18 Silver halide emulsions photosolubilized with optical sensitizing dyes and silver mercaptides
US403661A Expired - Lifetime US3284206A (en) 1961-12-08 1964-10-13 Image yielding layers

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US236412A Expired - Lifetime US3155514A (en) 1961-12-08 1962-11-08 Photographic compositions and elements
US236417A Expired - Lifetime US3155515A (en) 1961-12-08 1962-11-08 Photographic products

Family Applications After (5)

Application Number Title Priority Date Filing Date
US236418A Expired - Lifetime US3155516A (en) 1961-12-08 1962-11-08 Photographic products
US317824A Expired - Lifetime US3155519A (en) 1961-12-08 1963-10-21 Photographic compositions, layers and elements
US388919A Expired - Lifetime US3418124A (en) 1961-12-08 1964-08-11 High contrast direct positive by using active cations in silver halide solvent
US390460A Expired - Lifetime US3384485A (en) 1961-12-08 1964-08-18 Silver halide emulsions photosolubilized with optical sensitizing dyes and silver mercaptides
US403661A Expired - Lifetime US3284206A (en) 1961-12-08 1964-10-13 Image yielding layers

Country Status (5)

Country Link
US (8) US3155514A (cs)
BE (1) BE670823A (cs)
DE (5) DE1226877B (cs)
FR (1) FR89467E (cs)
GB (4) GB1031902A (cs)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284206A (en) * 1961-12-08 1966-11-08 Du Pont Image yielding layers
US3368898A (en) * 1963-10-17 1968-02-13 Gen Aniline & Film Corp Autopositive film and paper and emulsions therefor
US3377169A (en) * 1965-03-30 1968-04-09 Du Pont Copper thallium and lead halide and pseudohalides photosoluble crystals
US3379529A (en) * 1963-02-28 1968-04-23 Eastman Kodak Co Photographic inhibitor-releasing developers
US3394005A (en) * 1964-10-16 1968-07-23 Du Pont Increased development rate of photosoluble silver halide emulsions by the action of water-soluble iodide
US3407068A (en) * 1964-10-13 1968-10-22 Du Pont Photosolubilization
US3407067A (en) * 1964-10-13 1968-10-22 Du Pont Photosolubilization with mercaptooxazoles
US3464822A (en) * 1965-09-13 1969-09-02 Du Pont Process for making electrically conductive images
US3493373A (en) * 1967-06-23 1970-02-03 Du Pont Photosolubilization image formation process with organic dmax. maintainers
US3549379A (en) * 1966-03-01 1970-12-22 Minnesota Mining & Mfg Copying materials
US3628956A (en) * 1967-12-08 1971-12-21 Du Pont Process for preparing direct positive images by photosolubilization
US3640717A (en) * 1969-06-05 1972-02-08 Itek Corp Photographic reversal process employing organic mercaptan compounds
US3652279A (en) * 1969-07-18 1972-03-28 Du Pont Nitrogen-containing dmax maintainers for use in photosoluble emulsions
US4163669A (en) * 1977-04-27 1979-08-07 Mitsubishi Paper Mills, Ltd. Multilayer silver halide color photographic material

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1281842B (de) * 1964-06-22 1968-10-31 Du Pont Fotografisches Aufzeichnungsmaterial mit einer fotoloeslichen Schicht
US3341574A (en) * 1964-09-18 1967-09-12 Celanese Corp Di-(neopentylglycol mononeoheptanoate)azelate
US3458318A (en) * 1965-08-02 1969-07-29 Eastman Kodak Co Supersensitized silver halide emulsions
US3451819A (en) * 1965-08-09 1969-06-24 Du Pont Photosoluble silver halide emulsion made spontaneously developable with amine boranes
US3486895A (en) * 1966-04-29 1969-12-30 Du Pont Process for obtaining artistic effects in photosoluble direct positive silver halide emulsions
US3862352A (en) * 1968-04-16 1975-01-21 Itek Corp Photographically prepared electrical circuits wherein the photosensitive material is a photoconductor
US3647439A (en) * 1968-10-01 1972-03-07 Eastman Kodak Co Photographic element, composition and process
US3649289A (en) * 1968-10-21 1972-03-14 Eastman Kodak Co Photographic materials
US3653899A (en) * 1968-11-12 1972-04-04 Eastman Kodak Co Photographic materials and processes
US4014699A (en) * 1973-05-17 1977-03-29 Ciba-Geigy Ag Preparation for the processing of photographic materials
GB1548395A (en) * 1975-05-29 1979-07-11 Eastman Kodak Co Photographic materials
GB1580212A (en) * 1976-03-29 1980-11-26 Agfa Gevaert Antifogging and/or stabilizing compounds for silver halide photography
DE2931690A1 (de) * 1979-08-04 1981-02-19 Agfa Gevaert Ag Photographische emulsion, verfahren zur herstellung sowie photographische materialien

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2214446A (en) * 1938-05-10 1940-09-10 Gen Aniline & Film Corp Photographic development of silver halide layers
GB724001A (en) * 1951-04-30 1955-02-16 Agfa Ag Photographic light sensitive silver halide emulsions and process using the same
US2710256A (en) * 1951-04-25 1955-06-07 Gen Aniline & Film Corp Photographic print-out process
US3008829A (en) * 1960-04-11 1961-11-14 Gen Aniline & Film Corp Photographic materials and method of producing the same
US3038800A (en) * 1957-12-19 1962-06-12 Eastman Kodak Co Photopolymerization of olefinicallyunsaturated monomers by silver halides
US3046130A (en) * 1960-05-12 1962-07-24 Gen Aniline & Film Corp Photographic materials containing a chemical sensitizer
US3063837A (en) * 1958-11-07 1962-11-13 Agfa Ag Photographic diffusion transfer process for planographic printing
US3080230A (en) * 1956-02-18 1963-03-05 Agfa Ag Photographic stratum transfer process and element therefor

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE388620A (cs) * 1926-05-21
DE548323C (de) * 1929-02-25 1932-04-09 Kodak Akt Ges Verfahren zum Stabilisieren einer Silberhalogenemulsion
US2025876A (en) * 1931-04-11 1935-12-31 Du Pont Preparation of aryl-amines
US2131038A (en) * 1932-05-26 1938-09-27 Eastman Kodak Co Photographic emulsion containing alkyl quaternary salts of thiazoles and the like asantifoggants
GB477628A (en) * 1936-08-14 1938-01-04 Albert Steigmann Method of preventing yellow stain in photographs
US2195150A (en) * 1938-06-16 1940-03-26 Ilford Ltd Stabilization of photographic emulsions
US2520358A (en) * 1948-09-04 1950-08-29 Eastman Kodak Co Heterocyclic bis acetones, thioacetones, and selenoacetones
US2985661A (en) * 1956-02-06 1961-05-23 American Cyanamid Co Preparation of 2(omicron-aminophenyl)-benzimidazole
BE557661A (cs) * 1956-05-23
BE582161A (cs) * 1958-08-29
US3155518A (en) * 1963-10-21 1964-11-03 Du Pont Silver halide compositions, layers and elements
FR89467E (cs) * 1961-12-08

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2214446A (en) * 1938-05-10 1940-09-10 Gen Aniline & Film Corp Photographic development of silver halide layers
US2710256A (en) * 1951-04-25 1955-06-07 Gen Aniline & Film Corp Photographic print-out process
GB724001A (en) * 1951-04-30 1955-02-16 Agfa Ag Photographic light sensitive silver halide emulsions and process using the same
US3080230A (en) * 1956-02-18 1963-03-05 Agfa Ag Photographic stratum transfer process and element therefor
US3038800A (en) * 1957-12-19 1962-06-12 Eastman Kodak Co Photopolymerization of olefinicallyunsaturated monomers by silver halides
US3063837A (en) * 1958-11-07 1962-11-13 Agfa Ag Photographic diffusion transfer process for planographic printing
US3008829A (en) * 1960-04-11 1961-11-14 Gen Aniline & Film Corp Photographic materials and method of producing the same
US3046130A (en) * 1960-05-12 1962-07-24 Gen Aniline & Film Corp Photographic materials containing a chemical sensitizer

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284206A (en) * 1961-12-08 1966-11-08 Du Pont Image yielding layers
US3384485A (en) * 1961-12-08 1968-05-21 Du Pont Silver halide emulsions photosolubilized with optical sensitizing dyes and silver mercaptides
US3379529A (en) * 1963-02-28 1968-04-23 Eastman Kodak Co Photographic inhibitor-releasing developers
US3368898A (en) * 1963-10-17 1968-02-13 Gen Aniline & Film Corp Autopositive film and paper and emulsions therefor
US3407068A (en) * 1964-10-13 1968-10-22 Du Pont Photosolubilization
US3407067A (en) * 1964-10-13 1968-10-22 Du Pont Photosolubilization with mercaptooxazoles
US3394005A (en) * 1964-10-16 1968-07-23 Du Pont Increased development rate of photosoluble silver halide emulsions by the action of water-soluble iodide
US3377169A (en) * 1965-03-30 1968-04-09 Du Pont Copper thallium and lead halide and pseudohalides photosoluble crystals
US3464822A (en) * 1965-09-13 1969-09-02 Du Pont Process for making electrically conductive images
US3549379A (en) * 1966-03-01 1970-12-22 Minnesota Mining & Mfg Copying materials
US3493373A (en) * 1967-06-23 1970-02-03 Du Pont Photosolubilization image formation process with organic dmax. maintainers
US3495983A (en) * 1967-06-23 1970-02-17 Du Pont Photosolubilization process using phenols as dmax maintainers
US3495982A (en) * 1967-06-23 1970-02-17 Du Pont Process for dissolution development using thiourea compounds as dmax maintainers
US3628956A (en) * 1967-12-08 1971-12-21 Du Pont Process for preparing direct positive images by photosolubilization
US3640717A (en) * 1969-06-05 1972-02-08 Itek Corp Photographic reversal process employing organic mercaptan compounds
US3652279A (en) * 1969-07-18 1972-03-28 Du Pont Nitrogen-containing dmax maintainers for use in photosoluble emulsions
US4163669A (en) * 1977-04-27 1979-08-07 Mitsubishi Paper Mills, Ltd. Multilayer silver halide color photographic material

Also Published As

Publication number Publication date
US3155515A (en) 1964-11-03
DE1293582B (de) 1969-04-24
US3155514A (en) 1964-11-03
US3384485A (en) 1968-05-21
US3155519A (en) 1964-11-03
DE1261397B (de) 1968-02-15
DE1293581B (de) 1969-04-24
DE1294186B (de) 1969-09-11
US3284206A (en) 1966-11-08
GB1031902A (en) 1966-06-02
DE1226877B (de) 1966-10-13
US3155516A (en) 1964-11-03
GB1111226A (en) 1968-04-24
FR89467E (cs)
GB1124772A (en) 1968-08-21
GB1031903A (en) 1966-06-02
BE670823A (cs) 1966-04-12
US3418124A (en) 1968-12-24

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