US3615431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver images in light sensitive print forming layers
Assignee: Eastman Kodak Co
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Filing: 1968-07-15
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Granted: 1971-10-26
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Expires: 1988-07-15
Abstract
Abstract Photographic elements and processes feature photoconductive, substantially silver halide free, inorganic particles and a photoreactive sulfur compound which will react with the inorganic particles upon exposure to light to form sulfur containing sites for physical development. Subsequent to exposure, the element is physically developed to produce a negative of the original.
Inventors
- 👤 Paul B Gilman Jr
- 👤 Charles A Goffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:53
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/028; G03F7/0285; G03C; G03C1/00; G03C1/705; G03C1/72; G03C5/00; G03C5/58; G03C8/00; G03C8/02; G03C8/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
108 words
A photographic element of claim 1 in which said compound is a sulfur compound selected from the class consisting of dithiooxamide, 1,4-diphospha-2,3-dithia-1,1,4,4-tetra-methoxy-1, 4-butane dithione, 0,0-diethyl-8-methyl-phosphorothiolothionate, thioacetoamide, 1,2-dihydroxy-3-mercapto-propyl, S-oligoethylenesulfide-4-oligohydroxymethylene-oxide-8, L-cystine, 7,13-dithia-1,19-nonadecanediol, tetramethylene-bis-methylsulfone, isoproprylsulfoxide, di-n-hexyl sulfide, 5-bromo-1-pentane thioacetate, 2 -acetyl-chloropropyl mercaptan, Evan acid 3CS, thioglyceraldehyde, bis(2-isothiuroniumethyl)aminodichloride HC1, 3,8-dithiadecane 1,10-bis(n-methylpiperidinium) p-toluene sulfonate, L-cysteine (free base), glutathione, 2-mercaptoethyl amine HC1, cysteine HC1, thiodiproprionic acid, calcium thioglycolate, 2-hydroxyethyl isothiuronium trichloroacetate, 8-methyl tetrahydro thiapyran perchlorate, dithioammelide, sulfamic acid, mercapto acetic acid, ethyl xantic acid potassium salt, sodium dithionate, 3-mercapto-1,2-propane diol, sodium sulfide, Beta -dithio-carbamyl propionic acid, Beta -mercaptoproprionic acid, 4,4''-dithio-dimorpholine, thioformanilide, Beta -morpholino ethyl-thioacetate, ethylene dithiocyanate, ammonium sulfamate, 5,5''-thiodisalicylic acid, hydrogen sulfide and 2,5-dithiobiurea.
Claim 2
Dependent Claim
22 words
A photographic element of claim 1 in which said particles are selected from the class consisting of zinc oxide and zinc hydroxide.
Claim 3
Dependent Claim
13 words
A photographic element of claim 1 in which said particles are zinc oxide.
Claim 4
Dependent Claim
13 words
A photographic element of claim 1 in which said particles are zinc hydroxide.
Claim 5
Dependent Claim
51 words
A photographic element comprising a support having thereon about 20 mg./ft.2 to about 2 g./ft.2 inorganic light sensitive particles, substantially free of silver halide, and about 0.1 mg./ft.2 to about 10 mg./ft.2 sulfur compound which reacts with said particles upon exposure to light to form sulfur containing sites for physical development.
Claim 6
Dependent Claim
109 words
A photographic element of claim 6 in which said compound is a photoreactive sulfur compound selected from the class consisting of dithiooxamide, 1,4-diphospha-2,3-dithia-1,1,4,4-tetra-methoxy-1,4-butane dithione, 0-0-diethyl-8-methylphosphorothiolothionate, thioacetoamide, 1,2-dihydroxy-3-mercaptopropyl, S-oligoethylene-sulfide-4-oligohydroxymethylene-oxide-8, L-cysteine, 7,13-dithia-1,19-nonadecanediol, tetramethylene-bismethylsulfone, isopropyl-sulfoxide, di-n-hexyl sulfide, 5-bromo-1-pentane thioacetate, 2-acetyl-chloropropyl mercaptan, Evan acid 3CS, thioglyceraldehyde, bis(2-isothiuroniumethyl)aminodichloride HC1, 3,8-dithiadecane 1, 10-bis(n-methylpiperidinium) p-toluene sulfonate, L-cysteine (free base), glutathione, 2-mercaptoethyl amine HC1, cysteine HC1, thiodiproprionic acid, calcium thioglycolate, 2-hydroxyethyl isothiuronium trichloroacetate, 8-methyl tetrahydro thiapyran perchlorate, dithioammelide, sulfamic acid, mercapto acetic acid, ethyl xanthic acid potassium salt, sodium dithionate, 3-mercapto-1,2-propane diol, sodium sulfide, Beta -dithiocarbamyl propionic acid, Beta -mercaptoproprionic acid, 4,4''-dithiodimorpholine, thioformanilide, Beta -morpholino ethyl-thioacetate, ethylene dithiocyanate, ammonium sulfamate, 5,5''-thiodisalicylic acid, and hydrogen sulfide and 2,5-dithiobiurea.
Claim 7
Dependent Claim
22 words
A photographic element of claim 6 in which said particles are selected from the class consisting of zinc oxide and zinc hydroxide.
Claim 8
Dependent Claim
13 words
A photographic element of claim 6 in which said particles are zinc oxide.
Claim 9
Dependent Claim
13 words
A photographic element of claim 6 in which said particles are zinc hydroxide.
Claim 10
Dependent Claim
74 words
A process for forming a metallic image in a light sensitive photographic element comprising a support having thereon photoconductive, substantially silver halide free, inorganic particles and a sulfur compound which will react with said particles upon exposure to light to form sulfur containing sites for physical development, comprising (a) exposing said element to actinic radiation and (b) contacting said element with a solution of a reducable metallic compound and a silver halide developing agent.
Claim 11
Dependent Claim
109 words
A process of claim 11 in which said compound is a sulfur compound selected from the class consisting of dithiooxamide, 1, 4-diphospha-2,3-dithia-1,1,4,4-tetra-methoxy-1,4-butane dithione, 0,0-diethyl-8-methyl-phosphorothiolothionate, thioacetoamide, 1, 2-dihydroxy-3-mercaptopropyl, S-oligoethylenesulfide-4-oligohydroxymethylene-oxide-8, L-cystine, 7,13-dithia-1,19-nonadecanediol, tetramethylene-bis-methylsulfone, isopropylsulfoxide, di-n-hexyl sulfide, 5-bromo-1-pentane thioacetate, 2-acetyl-chloropropyl mercaptan, Evan acid 3CS thioglyceraldehyde, bis (2-isothiuroniumethyl)aminodichloride HC1, 3,8-dithiadecane 1,10 bis(n-methylpiperidinium) p-toluene sulfonate, L-cysteine (free base), glutathione, 2-mercaptoethyle amine HC1, cysTeine HC1, thiodiproprionic acid, calcium thioglycolate, 2-hydroxyethyl isothiouronium trichloroacetate, 8-methyl tetrahydro thiapyran perchloroate, dithioammelide, sulfamic acid, mercapto acetic acid, ethyl xanthic acid potassium salt, sodium dithionate, 3-mercapto-1,2-propane diol, sodium sulfide, Beta -dithiocarbamyl propionic acid, Beta -mercaptoproprionic acid, 4,4''-dithiodimorpholine, thioformanilide, Beta -morpholino ethyl-thioacetate, ethylene dithiocyanate, aammonium sulfamate, 5,5''-thiodisalicylic acid, hydrogen sulfide and 2,5-dithiobiurea.
Claim 12
Dependent Claim
23 words
A process of claim 11 in which said particles are selected from the class consisting of zinc oxide, zinc hydroxide and lead iodide.
Claim 13
Dependent Claim
12 words
A process of claim 11 in which said particles are zinc oxide.
Claim 14
Dependent Claim
12 words
A process of claim 11 in which said particles are zinc hydroxide.
Claim 15
Dependent Claim
12 words
A process of claim 11 in which said particles are lead iodide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |