US3536666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide-acid and polyimides prepared from aromatic diamines containing at least two tetraarylmethane nuclei
Assignee: 3M Co
•
Filing: 1968-11-29
•
Granted: 1970-10-27
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Expires: 1988-11-29
Abstract
No abstract record available.
Inventors
- 👤 Carl John Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:03
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1003; C08G73/1007; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3179614A
Cited
US3179634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |