US3471453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polybenzimidazole-polyamide copolymers and block polymers
Assignee: IFP Energies nouvelles
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Filing: 1967-01-04
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Granted: 1969-10-07
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Expires: 1987-01-04
Abstract
No abstract record available.
Inventors
- 👤 Guy Rabilloud
- 👤 Gabriel De Gaudemaris
- 👤 Bernard Sillion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:02
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/18; C08G69/00; C08G69/02; C08G69/26; C08G69/32; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3174947A
Cited
US3354125A
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 |