US2652391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of alpha-methylstyrene and alpha-methacrylonitrile
Assignee: Eastman Kodak Co
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Filing: 1951-08-22
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Granted: 1953-09-15
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Expires: 1971-08-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Roger M Schulken
- 👤 Jr Ralph E Boy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:37
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/12; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A RESINOUS COPOLYMER CONSISTING OF FROM 0.4 TO 0.6 MOLE FRACTION OF ALPHA-METHYLSTYRENE AND FROM 0.6 TO 0.4 MOLE FRACTION OF ALPHA-METHACRYLONITRILE, AND HAVING A MOLECULAR WEIGHT OF FROM 90,000 TO 250,300 AS DETERMINED BY THE INHERENT VISCOSITY OF SAID COPOLYMER IN N,N-DIMETHYL FORMAMIDE.
Claim 2
Dependent Claim
44 words
A RESINOUS COPOLYMER CONSISTING OF FROM 0.4 TO 0.6 MOLE FRACTION OF ALPHA-METHYLSTYRENE AND FROM 0.6 TO 0.4 MOLE FRACTION OF ALPHA-METHACRYLONITRILE, AND HAVING A MOLECULAR WEIGHT OF FROM 90,000 TO 250,300 AS DETERMINED BY THE INHERENT VISCOSITY OF SAID COPOLYMER IN N,N-DIMETHYL FORMAMIDE.
References Cited (Backward Citations)
US2486241A
Cited
US2496384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |