Patent US2531832A successfully refreshed from Google Patents.
US2531832A
Expired / Lapsed
US
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Silver halide developers containing polyethylene glycols
Assignee: EIDP Inc
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Filing: 1947-06-12
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Granted: 1950-11-28
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Expires: 1967-06-12
Abstract
No abstract record available.
Inventors
- 👤 Stanton William Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:17
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/3056; Y; Y10; Y10S; Y10S430/00; Y10S430/135; Y10S430/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
THE PROCESS OF DEVELOPING A SILVER HALIDE IMAGE WITH A PHOTOGRAPHIC DEVELOPER SOLUTION CONTAINING A SILVER HALIDE PHOTOGRAPHIC DEVELOPING AGENT AND A COMPOUND OF THE GENERAL FORMULA
Claim 2
Dependent Claim
27 words
THE PROCESS OF DEVELOPING A SILVER HALIDE IMAGE WITH A PHOTOGRAPHIC DEVELOPER SOLUTION CONTAINING A SILVER HALIDE PHOTOGRAPHIC DEVELOPING AGENT AND A COMPOUND OF THE GENERAL 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) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |