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US2590642A
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Solutions of polyamides in solvent mixtures
Assignee: EIDP Inc
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Filing: 1948-12-16
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Granted: 1952-03-25
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Expires: 1968-12-16
Abstract
No abstract record available.
Inventors
- 👤 Nichols James Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:44
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J2377/00; C08J2377/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
61 words
A SOLUTION, OF IMPROVED FLUIDITY, OF A SYNTHETIC LINEAR ALPHA-AMINO ACID POLYAMIDE, OF DEGREE OF POLYMERIZATION OF AT LEAST 25, IN A SOLVENT LIQUID BETWEEN 25 AND 300* C. AND OF ENERGY DENSITY LESS THAN 95, CONTAINING, DISSOLVED THEREIN, 0.5 TO 25%, BY WEIGHT OF THE SOLUTION, OF AN ORGANIC COMPOUND OF ENERGY DENSITY GREATER THAN 95 CALORIES PER CUBIC CENTIMETER.
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) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |