US3887376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic elements, compositions and processes
Assignee: Eastman Kodak Co
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Filing: 1974-06-13
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Granted: 1975-06-03
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Expires: 1994-06-13
Abstract
Abstract N-hydroxyurea silver halide developing agents in photographic processing compositions, elements and processes provide desired developing activity. These can be employed in various photographic products including processing compositions, photosensitive compositions, photographic elements and chemical transfer systems. They can be used in combination with other silver halide developing agents and with addenda commonly employed in photographic processing compositions and elements.
Inventors
- 👤 Burton D Wilson
- 👤 Paul E Woodgate
- 👤 Richard W Henn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:08
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49827; G03C1/005; G03C1/06; G03C1/42; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3014; G03C8/00; G03C8/02; G03C8/04; G03C8/06; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
A photographic processing composition comprising an alkaline development activator and an N-hydroxyurea silver halide developing agent, said N-hydroxyurea silver halide developing agent being represented by the formula:
Claim 2
Dependent Claim
27 words
A photographic processing composition comprising an alkaline development activator and an N-hydroxyurea silver halide developing agent, said N-hydroxyurea silver halide developing agent being represented by the formula:
Claim 3
Dependent Claim
83 words
A PHOTOGRAPHIC PROCESSING COMPOSITION COMPRISING AN ALKALINE DEVELOPMENT ACTIVATOR AND AN N-HYDROXYUREA SILVER HALIDE DEVELOPING AGENT, SAID N-HYDROXYUREA SILVER HALIDE DEVELOPING AGENT BEING REPRESENTED BY THE FORMULA: R1-N(-R2)-CO-N(-R3)-OH WHEREIN R1 IS HYDROGEN, ALKYL CONTAINING 1 TO 4 CARBON ATOMS OR ARYL CONTAINING 6 TO 10 CARBON ATOMS; R2 IS HYDROGEN, ALKYL CONTAINING 1 TO 4 CARBON ATOMS OR ARYL CONTAINING 6 TO 10 CARBON ATOMS; R3 IS HYDROGEN, ALKYL CONTAINING 1 TO 4 CARBON ATOMS OR ARYL CONTAINING 6 TO 10 CARBON ATOMS.
Claim 4
Dependent Claim
83 words
A PHOTOGRAPHIC PROCESSING COMPOSITION COMPRISING AN ALKALINE DEVELOPMENT ACTIVATOR AND AN N-HYDROXYUREA SILVER HALIDE DEVELOPING AGENT, SAID N-HYDROXYUREA SILVER HALIDE DEVELOPING AGENT BEING REPRESENTED BY THE FORMULA: R1-N(-R2)-CO-N(-R3)-OH WHEREIN R1 IS HYDROGEN, ALKYL CONTAINING 1 TO 4 CARBON ATOMS OR ARYL CONTAINING 6 TO 10 CARBON ATOMS; R2 IS HYDROGEN, ALKYL CONTAINING 1 TO 4 CARBON ATOMS OR ARYL CONTAINING 6 TO 10 CARBON ATOMS; R3 IS HYDROGEN, ALKYL CONTAINING 1 TO 4 CARBON ATOMS OR ARYL CONTAINING 6 TO 10 CARBON ATOMS.
Claim 5
Dependent Claim
9 words
The photographic processing composition of claim 1 wherein said
Claim 6
Dependent Claim
15 words
The photographic processing composition of claim 1 also comprising a 3-pyrazolidone silver halide developing agent.
References Cited (Backward Citations)
US2147441A
Cited
US2404774A
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US2477323A
Cited
US2819165A
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US3438776A
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US3730727A
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US3794488A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |