US2843488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic layers containing the reaction product of ammonia on a styrene-maleic anhydride copolymer
Assignee: Eastman Kodak Co
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Filing: 1954-06-23
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Granted: 1958-07-15
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Expires: 1974-06-23
Abstract
No abstract record available.
Inventors
- 👤 Godowsky Leopold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:26
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388; G03C7/3882
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
PHOTOGRAPHIC GELATIN LAYERS WHICH CONTAIN IN A MINOR AMOUNT THE REACTION PRODUCT OF AMMONIA ON A COPOLYMER CONTAINING AS THE MAIN MONOMERS STYRENE AND MALEIC ACID ANHYDRIDE.
Claim 2
Dependent Claim
27 words
PHOTOGRAPHIC GELATIN LAYERS WHICH CONTAIN IN A MINOR AMOUNT THE REACTION PRODUCT OF AMMONIA ON A COPOLYMER CONTAINING AS THE MAIN MONOMERS STYRENE AND MALEIC ACID ANHYDRIDE.
References Cited (Backward Citations)
US1976679A
Cited
US1981102A
Cited
US2399084A
Cited
GB630016A
Cited
US2565418A
Cited
US2607762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |