Patent US2721114A successfully refreshed from Google Patents.
US2721114A
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Solutions of polyacrylonitrile and acrylonitrile copolymers in mixtures of formic acid, oxalic acid, and water
Assignee: Acordis UK Ltd
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Filing: 1954-02-01
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Granted: 1955-10-18
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Expires: 1974-02-01
Abstract
No abstract record available.
Inventors
- 👤 Downing John
- 👤 Hodge Arthur
- 👤 Drewitt James Gordon Napier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:37
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/095; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
COMPOSITIONS COMPRISING A FIBRE-FORMING POLYMER DERIVED FROM AT LEAST ONE MONOVINYL MONOMER AND CONTAINING MORE THAN 85% BY WEIGHT OF ACRYLONITRILE, DISSOLVED IN A MIXTURE OF 20-40% BY WEIGHT OF FORMIC ACID, 60-45% BY WEIGHT OF OXALIC ACID, AND 25-10% BY WEIGHT OF WATER.
Claim 2
Dependent Claim
44 words
COMPOSITIONS COMPRISING A FIBRE-FORMING POLYMER DERIVED FROM AT LEAST ONE MONOVINYL MONOMER AND CONTAINING MORE THAN 85% BY WEIGHT OF ACRYLONITRILE, DISSOLVED IN A MIXTURE OF 20-40% BY WEIGHT OF FORMIC ACID, 60-45% BY WEIGHT OF OXALIC ACID, AND 25-10% BY WEIGHT OF WATER.
References Cited (Backward Citations)
US2503245A
Cited
US2588335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |