US2544638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of acrylonitrile and n-allyl and n-2-methallyl ureas
Assignee: Eastman Kodak Co
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Filing: 1949-12-28
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Granted: 1951-03-13
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Expires: 1969-12-28
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:01
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A COPOLYMER OF FROM 60 TO 98 PER CENT BY WEIGHT OF ACRYLONITRILE AND FROM 40 TO 2 PER CENT BY WEIGHT OF AN N-ALKENYL UREA HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
30 words
A COPOLYMER OF FROM 60 TO 98 PER CENT BY WEIGHT OF ACRYLONITRILE AND FROM 40 TO 2 PER CENT BY WEIGHT OF AN N-ALKENYL UREA HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
US2318959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |