US3242136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammonium salts of aromatic polyamideacids and process for preparing polyimides therefrom
Assignee: EIDP Inc
•
Filing: 1962-11-09
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Granted: 1966-03-22
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Expires: 1982-11-09
Abstract
No abstract record available.
Inventors
- 👤 Endrey Andrew Laszlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:39
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; Y; Y10; Y10S; Y10S525/00; Y10S525/928; Y10S526/00; Y10S526/923
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PROCESS FOR PREPARING POLYMIDES WHICH COMPRISES REACTING AN AROMATIC DIAMINE WITH AN AROMATIC TETRACARBOXYLIC ACID DIANYHDRIDE, ALL FOUR CARBONYL GROUPS OF SAID DIANHYDRIDE BEING DIRECTLY ATTACHED TO AN AROMATIC RING OF SAID DIANHYDRIDE, IN AN ORGANIC SOLVENT FOR AT LEAST ONE REACTANT FOR A TIME AND AT A TEMPERATURE BELOW 175*C. SUFFICIENT TO FORM A POLYAMIDE-ACID INTERMEDIATE SOLUBLE IN SAID SOLVENT; ADDING A TERTIARY AMINE OF THE FORMULA:
Claim 2
Dependent Claim
69 words
A PROCESS FOR PREPARING POLYMIDES WHICH COMPRISES REACTING AN AROMATIC DIAMINE WITH AN AROMATIC TETRACARBOXYLIC ACID DIANYHDRIDE, ALL FOUR CARBONYL GROUPS OF SAID DIANHYDRIDE BEING DIRECTLY ATTACHED TO AN AROMATIC RING OF SAID DIANHYDRIDE, IN AN ORGANIC SOLVENT FOR AT LEAST ONE REACTANT FOR A TIME AND AT A TEMPERATURE BELOW 175*C. SUFFICIENT TO FORM A POLYAMIDE-ACID INTERMEDIATE SOLUBLE IN SAID SOLVENT; ADDING A TERTIARY AMINE OF THE FORMULA:
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |