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Patent US3520855A successfully refreshed from Google Patents.
US3520855A
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US
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Acrylonitrile copolymers
Assignee: Bayer AG
•
Filing: 1968-01-26
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Granted: 1970-07-21
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Expires: 1988-01-26
Abstract
No abstract record available.
Inventors
- 👤 Jeno Szita
- 👤 Heinrich Rinkler
- 👤 Alfred Nogaj
- 👤 Gunther Nischk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:32
CPC Classifications
C; C07; C07C; C07C243/00; C07C243/24; C07C243/36; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; Y; Y10; Y10S; Y10S526/00; Y10S526/923
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3408338A
Cited
US3412077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |