US3150113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous polyamides based on terephthalic acid and alkyl substituted hexamethylene diamines
Assignee: WR Grace and Co
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Filing: 1961-06-30
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Granted: 1964-09-22
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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
2026-11-04 19:14
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A PROCESS FOR THE PRODUCTION OF A LINEAR POLYAMIDE WHICH COMPRISES CONDENSING TEREPHTHALIC ACID WITH A SUBSTANTIALLY EQUIMOLAR PORPORTION OF AN ISOMERIC MIXTURE OF ABOUT 75 PERCENT OF 3-METHYLHEXAMETHYLENEDIAMINE AND ABOUT 25 PERCENT OF 2-METHYLHEXAMETHYLENEDIAMINE.
Claim 2
Dependent Claim
35 words
A PROCESS FOR THE PRODUCTION OF A LINEAR POLYAMIDE WHICH COMPRISES CONDENSING TEREPHTHALIC ACID WITH A SUBSTANTIALLY EQUIMOLAR PORPORTION OF AN ISOMERIC MIXTURE OF ABOUT 75 PERCENT OF 3-METHYLHEXAMETHYLENEDIAMINE AND ABOUT 25 PERCENT OF 2-METHYLHEXAMETHYLENEDIAMINE.
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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |