Patent US3249561A successfully refreshed from Google Patents.
US3249561A
Expired / Lapsed
US
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Forming a foamed polyimide article
Assignee: EIDP Inc
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Filing: 1963-03-18
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Granted: 1966-05-03
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Expires: 1983-03-18
Abstract
No abstract record available.
Inventors
- 👤 Hendrix William Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:27
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1046; C08G73/105; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A PROCESS WHICH COMPRISES MIXING AT LEAST ONE DIAMINE WITH AT LEAST ONE TETRACARBOXYLIC ACID DIANHYDRIDE HAVING THE STRUCTURAL FORMULA:
Claim 2
Dependent Claim
20 words
A PROCESS WHICH COMPRISES MIXING AT LEAST ONE DIAMINE WITH AT LEAST ONE TETRACARBOXYLIC ACID DIANHYDRIDE HAVING THE STRUCTURAL FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |