US3242128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating compositions comprising aromatic polyamic acid and solvent therefor with viscosity stabilizing agent therefor
Assignee: EIDP Inc
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Filing: 1962-07-30
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Granted: 1966-03-22
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Expires: 1982-07-30
Abstract
No abstract record available.
Inventors
- 👤 John Ritchie Chalmers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:06
CPC Classifications
C; C09; C09J; C09J179/00; C09J179/04; C09J179/08; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1028; C08G73/1032; C08G73/1057; C08L; C08L79/00; C08L79/04; C08L79/08; C09D; C09D179/00; C09D179/04; C09D179/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
80 words
A POLYAMIC ACID COMPOSITION CHARACTERIZED BY IMPROVED SOLUTION VISCOSITY CHARACTERISTICS CONSISTING ESSENTIALLY OF A POLYAMIC ACID IN SOLUTION IN A VOLATILE LIQUID ORGANIC SOLVENT THEREFOR AND CONTAINING, AS A SOLUTION VISCOSITY STABILIZING COMPONENT AN EFFECTIVE PROPORTION OF ABOUT 0.0003 TO 0.025 GRAM MOLE PER 100 GRAMS OF POLYAMIC ACID OF A MEMBER OF THE GROUP CONSISTING OF FORMIC ACID, MONOCHLOROACETIC ACID, BENZALDEHYDE, PARA-AMINOPHENOL AND PARA-NITROBENZALDEHYDE, SAID POLYAMIC ACID CONSISTING ESSENTIALLY OF A PLURALITY OF RECURRING UNITS HAVING THE GENERAL STRUCTURE:
Claim 2
Dependent Claim
80 words
A POLYAMIC ACID COMPOSITION CHARACTERIZED BY IMPROVED SOLUTION VISCOSITY CHARACTERISTICS CONSISTING ESSENTIALLY OF A POLYAMIC ACID IN SOLUTION IN A VOLATILE LIQUID ORGANIC SOLVENT THEREFOR AND CONTAINING, AS A SOLUTION VISCOSITY STABILIZING COMPONENT AN EFFECTIVE PROPORTION OF ABOUT 0.0003 TO 0.025 GRAM MOLE PER 100 GRAMS OF POLYAMIC ACID OF A MEMBER OF THE GROUP CONSISTING OF FORMIC ACID, MONOCHLOROACETIC ACID, BENZALDEHYDE, PARA-AMINOPHENOL AND PARA-NITROBENZALDEHYDE, SAID POLYAMIC ACID CONSISTING ESSENTIALLY OF A PLURALITY OF RECURRING UNITS HAVING THE GENERAL STRUCTURE:
Claim 3
Dependent Claim
22 words
A STABILIZED POLYAMIC ACID COMPOSITION OF CLAIM 1 WHEREIN SAID VOLATILE ORGANIC SOLVENT FOR THE POLYAMIC ACID COMPRISES A NORMALLY LIQUID N,N-DIALKYLCARBOXYLAMIDE.
References Cited (Backward Citations)
US2374145A
Cited
US3073784A
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 |