US3533996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of crosslinked polyimides from n,n'-bis-imides
Assignee: Rhodiaceta SA
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Filing: 1968-01-19
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Granted: 1970-10-13
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Expires: 1988-01-19
Abstract
No abstract record available.
Inventors
- 👤 Friedrich Grundschober
- 👤 Joerg Sambeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:31
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/125; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; C08F; C08F22/00; C08F22/36; C08G73/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2890206A
Cited
US2890207A
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US2971944A
Cited
US3074915A
Cited
US3380964A
Cited
US3406148A
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 |