US3145193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides from a mixture of isophthalic acid, terephthalic acid and branched chain aliphatic diamine
Assignee: WR Grace and Co
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Filing: 1961-06-30
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Granted: 1964-08-18
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Expires: 1981-06-30
Abstract
No abstract record available.
Inventors
- 👤 Gabler Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:23
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A PROCESS FOR PRODUCING A LINEAR, AMORPHOUS, FILMFORMING POLYAMIDE WHICH COMPRISES CONDENSING SUBSTANTIALLY EQUIMOLAR AMOUNTS OF AN ACID MIXTURE OF 90 TO 95 PERCENT TEREPHTHALIC ACID AND 5 TO 10 PERCENT ISOPHTHALIC ACID WITH AN ALIPHATIC POLYMETHYLENE DIAMINE SELECTED FROM THE GROUP CONSISTING OF 2-METHYL-4-ETHYLHEPTAMETHYLENEDIAMINE; 2-ETHYL-4-METHYLHEPTAMETHYLENEDIAMINE; 2,2,5,5-TETRAMETHYLHEPTAMETHYLENEDIAMINE; 3-ISOPROPYLHEPTAMETHYLENEDIAMINE; 3-ISOOCTYLHEPTAMETHYLENEDIAMINE; 3,3,5-TRIMETHYLOCTAMETHYLENEDIAMINE; AND 2,4DIETHYLOCTAMETHYLENEDIAMINE.
Claim 2
Dependent Claim
52 words
A PROCESS FOR PRODUCING A LINEAR, AMORPHOUS, FILMFORMING POLYAMIDE WHICH COMPRISES CONDENSING SUBSTANTIALLY EQUIMOLAR AMOUNTS OF AN ACID MIXTURE OF 90 TO 95 PERCENT TEREPHTHALIC ACID AND 5 TO 10 PERCENT ISOPHTHALIC ACID WITH AN ALIPHATIC POLYMETHYLENE DIAMINE SELECTED FROM THE GROUP CONSISTING OF 2-METHYL-4-ETHYLHEPTAMETHYLENEDIAMINE; 2-ETHYL-4-METHYLHEPTAMETHYLENEDIAMINE; 2,2,5,5-TETRAMETHYLHEPTAMETHYLENEDIAMINE; 3-ISOPROPYLHEPTAMETHYLENEDIAMINE; 3-ISOOCTYLHEPTAMETHYLENEDIAMINE; 3,3,5-TRIMETHYLOCTAMETHYLENEDIAMINE; AND 2,4DIETHYLOCTAMETHYLENEDIAMINE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |