US3179630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyimides by treating polyamide-acids with lower fatty monocarboxylic acid anhydrides
Assignee: EIDP Inc
•
Filing: 1962-01-26
•
Granted: 1965-04-20
•
Expires: 1982-01-26
Abstract
No abstract record available.
Inventors
- 👤 Endrey Andrew Laszlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:12
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; Y; Y10; Y10S; Y10S525/00; Y10S525/928
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
IN A PROCESS FOR PREPARING POLYIMIDES WHEREIN AT LEAST ONE DIAMINE HAVNG THE STRUCTURAL FORMULA:
Claim 2
Dependent Claim
15 words
IN A PROCESS FOR PREPARING POLYIMIDES WHEREIN AT LEAST ONE DIAMINE HAVNG THE STRUCTURAL FORMULA:
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |