Patent US3729531A successfully refreshed from Google Patents.
US3729531A
Expired / Lapsed
US
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Vacuole-free filaments and films of acrylonitrile copolymers
Assignee: Bayer AG
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Filing: 1971-03-19
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Granted: 1973-04-24
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Expires: 1991-03-19
Abstract
Abstract VACUOLE FREE FILAMENTS AND FILMS OR COPOLYMERS OF ACRYLONTRILE AND VINYLIDENE CHLORIDE, WHICH CONTAIN 0.1 TO 4% OF A HOMOPOLYMER OF DIMETHYLACRYLAMIDE OR OF A COPOLYMER OF ACRYLONTRILE WITH DIMETHYL ACRYLAMIDE.
Inventors
- 👤 C Suling
- 👤 H Logemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:01
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08L; C08L33/00; C08L33/18; C08L33/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |