Patent US2649438A successfully refreshed from Google Patents.
US2649438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of acrylonitrile and basic acrylamides
Assignee: Industrial Rayon Corp
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Filing: 1950-10-28
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Granted: 1953-08-18
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Expires: 1970-10-28
Abstract
No abstract record available.
Inventors
- 👤 Herman A Bruson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:47
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
AS A NEW COMPOSITION OF MATTER, A COPOLYMER DERIVED BY THE POLYMERIZATION OF A MIXTURE COMPRISING ACRYLONITRILE AND A WATER-SOLUBLE SILFURIC ACID SALT OF N-MORPHOLINORTHYL ACRYLAMIDE; AND COPOLYMER CONTAINING IN THE POLYMER MOLECULE AT LEAST ABOUT 85% BY WEIGHT OF ACRYLONITRILE AND BETWEEN ABOUT 2% AND 10% OF SAID ACRYLAMIDE COMPOUND.
Claim 2
Dependent Claim
51 words
AS A NEW COMPOSITION OF MATTER, A COPOLYMER DERIVED BY THE POLYMERIZATION OF A MIXTURE COMPRISING ACRYLONITRILE AND A WATER-SOLUBLE SILFURIC ACID SALT OF N-MORPHOLINORTHYL ACRYLAMIDE; AND COPOLYMER CONTAINING IN THE POLYMER MOLECULE AT LEAST ABOUT 85% BY WEIGHT OF ACRYLONITRILE AND BETWEEN ABOUT 2% AND 10% OF SAID ACRYLAMIDE COMPOUND.
References Cited (Backward Citations)
US2478378A
Cited
US2560680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |