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Patent US3533997A successfully refreshed from Google Patents.
US3533997A
Expired / Lapsed
US
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Crosslinkable polyamide-acids and polyimides and crosslinked polymeric products made therefrom
Assignee: EIDP Inc
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Filing: 1969-05-28
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Granted: 1970-10-13
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Expires: 1989-05-28
Abstract
No abstract record available.
Inventors
- 👤 Rudolf J Angelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:18
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/101; C08G73/1042; C08G73/1067; C08G73/1075; C08G73/1085; Y; Y10; Y10S; Y10S525/00; Y10S525/928
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3179614A
Cited
US3338859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |