Patent US3494823A successfully refreshed from Google Patents.
US3494823A
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US
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Shaped polyimides and method
Assignee: 3M Co
•
Filing: 1967-01-17
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Granted: 1970-02-10
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Expires: 1987-01-17
Abstract
No abstract record available.
Inventors
- 👤 James R Haller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:00
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/74; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/298
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2747222A
Cited
US3179633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |