US2541889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkyl ethers of polyhydroxyaralkylamines as accelerators
Assignee: GAF Chemicals Corp
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Filing: 1949-11-16
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Granted: 1951-02-13
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Expires: 1969-11-16
Abstract
No abstract record available.
Inventors
- 👤 Ivy V Runyan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:15
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
AN ALKALINE PHOTOGRAPHIC DEVELOPER FOR SILVER HALIDE EMULSIONS COMPRISING AN AROMATIC SILVER HALIDE DEVELOPING AGENT AND AN ALKYL ETHER OF A POLYHYDROXYARALKYLAMINE SELECTED FROM THE CLASS CONSISTING OF THOSE OF THE FOLLOWING FORMULAE:
Claim 2
Dependent Claim
33 words
AN ALKALINE PHOTOGRAPHIC DEVELOPER FOR SILVER HALIDE EMULSIONS COMPRISING AN AROMATIC SILVER HALIDE DEVELOPING AGENT AND AN ALKYL ETHER OF A POLYHYDROXYARALKYLAMINE SELECTED FROM THE CLASS CONSISTING OF THOSE OF THE FOLLOWING FORMULAE:
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) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |