Patent US2599518A successfully refreshed from Google Patents.
US2599518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High contrast photographic developers
Assignee: EDWAL LAB Inc
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Filing: 1951-04-25
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Granted: 1952-06-03
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Expires: 1971-04-25
Abstract
No abstract record available.
Inventors
- 👤 Schwarcz Morton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:57
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
AN AQUEOUS PHOTOGRAPHIC DEVELOPING SOLUTION COMPRISING A SILVER HALIDE DEVELOPING AGENT, AN ALKAKI METAL SULFITE AND A METHYLOL HYDANTION.
Claim 2
Dependent Claim
19 words
AN AQUEOUS PHOTOGRAPHIC DEVELOPING SOLUTION COMPRISING A SILVER HALIDE DEVELOPING AGENT, AN ALKAKI METAL SULFITE AND A METHYLOL HYDANTION.
References Cited (Backward Citations)
US2364017A
Cited
US2477323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |