US2572931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular products comprising acrylonitrile polymers
Assignee: Akzo Nobel UK PLC
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Filing: 1947-11-01
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Granted: 1951-10-30
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Expires: 1967-11-01
Abstract
No abstract record available.
Inventors
- 👤 Robert H Helle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/20; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |