Patent US2992213A successfully refreshed from Google Patents.
US2992213A
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US
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Acid cooked pigskin gelatins for photographic subbing
Assignee: Eastman Kodak Co
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Filing: 1957-11-08
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Granted: 1961-07-11
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Expires: 1977-11-08
Abstract
No abstract record available.
Inventors
- 👤 Jr John W Gates
- 👤 Paul E Miller
- 👤 Robert R Phillips
- 👤 Gale F Nadeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:51
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A METHOD OF TREATING ACID COOKED PIGSKIN GELATIN TO ADAPT IT FOR PHOTOGRAPHIC SUBBING PURPOSES WHICH COMPRISES LEACHING ACID COOKED PIGSKIN GELATIN HAVING HIGH JELLY STRENGTH WITH AQUEOUS ALKALI SELECTED FROM THE GROUP CONSISTING OF THE AQUEOUS SOLUTIONS OF AMMONIA AND OF ALKALINE ALKALI METAL COMPOUNDS FOR 1-6 HOURS AT A PH OF 8-9.5 AND A TEMPERATURE WITHIN THE RANGE OF 35-55* F. FOLLOWED BY WASHING TO REMOVE THE ALKALI.
Claim 2
Independent Claim
70 words
A METHOD OF TREATING ACID COOKED PIGSKIN GELATIN TO ADAPT IT FOR PHOTOGRAPHIC SUBBING PURPOSES WHICH COMPRISES LEACHING ACID COOKED PIGSKIN GELATIN HAVING HIGH JELLY STRENGTH WITH AQUEOUS ALKALI SELECTED FROM THE GROUP CONSISTING OF THE AQUEOUS SOLUTIONS OF AMMONIA AND OF ALKALINE ALKALI METAL COMPOUNDS FOR 1-6 HOURS AT A PH OF 8-9.5 AND A TEMPERATURE WITHIN THE RANGE OF 35-55* F. FOLLOWED BY WASHING TO REMOVE THE ALKALI.
References Cited (Backward Citations)
US1865497A
Cited
US2351174A
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US2398004A
Cited
GB625873A
Cited
US2598608A
Cited
US2834771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |