US3342774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct preparation of aromatic polyimides
Assignee: EIDP Inc
•
Filing: 1964-01-20
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Granted: 1967-09-19
•
Expires: 1984-01-20
Abstract
No abstract record available.
Inventors
- 👤 Erhard F Hoegger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1028
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
THE PROCESS COMPRISING ESSENTIALLY COMPLETELY INTERMIXING IN UNDER ABOUT ONE SECOND CONCURRENTLY WITH SHAPING A (1) SOLUTION CONTAINING (A) AN AROMATIC DIANHYDRIDE HAVING THE STRUCTURAL FORMULA:
Claim 2
Dependent Claim
26 words
THE PROCESS COMPRISING ESSENTIALLY COMPLETELY INTERMIXING IN UNDER ABOUT ONE SECOND CONCURRENTLY WITH SHAPING A (1) SOLUTION CONTAINING (A) AN AROMATIC DIANHYDRIDE HAVING THE STRUCTURAL FORMULA:
References Cited (Backward Citations)
US3179634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |