US3627736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides from isophorone diamine, hexamethylene diamine, isophthalic acid and terephthalic acid
Assignee: Individual
•
Filing: 1970-05-28
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Granted: 1971-12-14
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Expires: 1990-05-28
Abstract
Abstract A tough transparent amorphous polyamide based on isophthalic acid, terephthalic acid, hexamethylene diamine to isophorone diamine wherein 5 to 50 moles percent of the diamines are based on isophorone diamine and at least 50 moles percent of the diamines are based on hexamethylene diamine. The polyamide has good impact strength, resistance to boiling water and little tendency to absorb water.
Inventors
- 👤 Alaric Louis Jeffrey Raum
- 👤 Prem Sagar Thukral
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:14
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265; Y; Y10; Y10S; Y10S264/00; Y10S264/61
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
A polyamide as defined in claim 1 wherein from 10 to 40 mole percent of the amine content of the polyamide is isophorone diamine.
Claim 2
Dependent Claim
21 words
A polyamide as defined in claim 1 wherein from 50 to 80 mole percent of the acid content is isophthalic acid.
Claim 3
Dependent Claim
49 words
A polyamide as defined in claim 1 wherein 60 mole percent of the acid content is isophthalic acid, 40 mole percent of the acid content is terephthalic acid, 85 mole percent of the amine content is hexamethylene diamine and 15 mole percent of the amine content is isophorone diamine.
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |