US3276875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing composition with pyrrolidone anti-sludging agent
Assignee: EIDP Inc
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Filing: 1963-12-02
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Granted: 1966-10-04
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Expires: 1983-12-02
Abstract
No abstract record available.
Inventors
- 👤 Jr Henry John Schwalenstocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:21
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A PHOTOGRAPHIC DEVELOPING COMPOSITION COMPRISING AN AQUEOUS SOLUTION OF A SILVER HALIDE DEVELOPING AGENT AND ABOUT 10 TO 110 GRAMS PER LITER OF SAID SOLUTION OF AN ANTI-SLUDGING COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
32 words
A PHOTOGRAPHIC DEVELOPING COMPOSITION COMPRISING AN AQUEOUS SOLUTION OF A SILVER HALIDE DEVELOPING AGENT AND ABOUT 10 TO 110 GRAMS PER LITER OF SAID SOLUTION OF AN ANTI-SLUDGING COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |