US2610122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide developer containing 2(beta-hydroxyethyl) aminophenol and p-hydroxyphenylamino acetic acid
Assignee: May and Baker Ltd
•
Filing: 1950-05-12
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Granted: 1952-09-09
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Expires: 1970-05-12
Abstract
No abstract record available.
Inventors
- 👤 John David Hugh Oakley
- 👤 Field George Terence James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:14
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3021
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
54 words
A PHOTOGRAPHIC DEVELOPER FOR SILVER HALIDE EMULSIONS COMPRISING A SALT OF 2(B-HYDROXYETHYL) AMINOPHENOL AND P-HYDROXYPHENYLAMINO ACETIC ACID IN AQUEOUS ALKALINE SOLUTION, THE CONCENTRATION OF 2(B - HYDROXYETHYL)AMINOPHENOL (CALCULATED AS SULPHATE) BEING BETWEEN 4 AND 8 GRAMS PER LITRE, AND THE CONCENTRATION OF P-HYDROXYPHENYLAMINO ACETIC ACID BEING FROM 10-30% OF THE SAID CONCENTRATION OF 4(B-HYDROXYETHYL)AMINOPHENOL.
References Cited (Backward Citations)
US1758762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |