Patent US3682960A successfully refreshed from Google Patents.
US3682960A
Expired / Lapsed
US
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Polyimide compositions and metallic articles coated therewith
Assignee: JAMES R HALLER
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Filing: 1970-03-09
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Granted: 1972-08-08
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Expires: 1990-03-09
Abstract
Abstract Polymer-metal laminate composites having improved adhesion between metallic and polymer laminae, the polymer consisting essentially of a mixture of a polyimide and a polyimide containing amide groups along the backbone of the polymer chain; and compositions adapted to making such laminates, containing the said polymer mixture in solution in a suitable solvent.
Inventors
- 👤 James R Haller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:51
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A composition for coating metallic substrates to produce strongly adherent dielectric coatings thereon, comprising a solution in a volatile solvent for said polymers of a mixture of a curable polyamic acid and about 10 to 85 percent by weight, based on total solids, of an amide-modified polyamic acid wherein the curable polyamic acid is a copolymer of bis(4-aminophenyl) ether and 3,4,3'',4'', -benzophenone tetracarboxylic dianhydride and the amide-modified polyamic acid is a copolymer of trimellitic anhydride and methylene dianiline.
Claim 2
Dependent Claim
13 words
A composition according to claim 2 in which the solvent is dimethyl Acetamide.
References Cited (Backward Citations)
CA729275A
Cited
US3422061A
Cited
US3320202A
Cited
US3342897A
Cited
US3440215A
Cited
US3523098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |