Patent US3806345A successfully refreshed from Google Patents.
US3806345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxylamine photographic developer
Assignee: Individual
•
Filing: 1970-10-07
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Granted: 1974-04-23
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Expires: 1990-10-07
Abstract
Abstract N,N-DIALKYLHYDROXYLAMINE DERIVATIVES HAVING THE FORMULA R1-N(-OH)-R2 WHEREIN AT LEAST ONE OF R1 AND R2 IS AN ALKYL GROUP COMPRISING A QUATERNARY AMMONIUM GROUP EITHER CYCLIC OR ACYLICAND THE OTHER OF R1 AND R2 IS AN ALKYL GROUP OR AN ALKYL GROUP COMPRISING A QUATERNARY AMMONIUM GROUP EITHER CYCLIC OR ACYCLIC, AND THEIR USE IN DEVELOPER COMPOSITIONS FOR THE DEVELOPEMENT OF SILVER HALIDE EMULSIONS ARE DESCRIBED. THE DEVELOPERS HAVE HIGH DEVELOPEMENT ACTIVITY AND LOW FOG.
Inventors
- 👤 J Willems
- 👤 F Sels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:27
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3014
Claims Analysis
Total Claims: 0
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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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |