US3862092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide-imide compositions
Assignee: General Electric Co
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Filing: 1973-07-05
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Granted: 1975-01-21
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Expires: 1993-07-05
Abstract
Abstract This invention relates to new polyamide-imide compositions having good hydrolytic stability and formed by reacting maleic anhydride with an intermediate diamine formed by reaction of trimellitic anhydride, hexamethylene diamine and an aromatic diamine. The resulting composition is useful for electrical insulating purposes in the form of films or coatings.
Inventors
- 👤 Ralph G Flowers
- 👤 Thomas L Sherer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:38
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
A composition as defined in claim 1, wherein said aromatic diamine is methylene dianiline.
Claim 2
Dependent Claim
15 words
A metal having a coating thereon of a polyamide-imide composition as defined in claim 1.
Claim 3
Dependent Claim
25 words
A composition as defined in claim 1, wherein about 1 to about 20 percent of maleic anhydride by weight of said reaction product is employed.
Claim 4
Dependent Claim
25 words
A composition as defined in claim 4, wherein about 7 to about 15 percent of maleic anhydride by weight of said reaction product is employed.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |