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US3471430A
Expired / Lapsed
US
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Copolymers of cyclic acetals and functional derivatives of acrylic acids
Assignee: Hoechst AG Werk Kalle Albert
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Filing: 1968-03-14
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Granted: 1969-10-07
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Expires: 1988-03-14
Abstract
No abstract record available.
Inventors
- 👤 Rolf Zimmerman
- 👤 Hermann Hotze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:55
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6212; C08F; C08F20/00; C08F20/62; C08F24/00; C08F8/00; C08F8/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3281377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |