US3779858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable non-blistering polyimide laminates
Assignee: EIDP Inc
•
Filing: 1971-09-24
•
Granted: 1973-12-18
•
Expires: 1991-09-24
Abstract
Abstract Non-blistering polyimide laminates are formed from polyimide precursor impregnated sheets wherein the resultant polyimide laminate has a void volume of at least about 3.5% and not more than about 10%, as measured by mercury intrusion method, and the voids exist substantially in and around the fabric layer.
Inventors
- 👤 R Hiss
- 👤 H Kime
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:49
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/003; B32; B32B; B32B15/00; B32B15/14; B32B5/00; B32B5/22; B32B5/24; B32B5/26; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; B29K; B29K2309/00; B29K2309/08; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/023; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/10; B32B2262/101; H05K1/0272; H05K1/032; H05K1/0346; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721; Y10T442/00; Y10T442/20; Y10T442/2475; Y10T442/30; Y10T442/3382; Y10T442/3415
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
15 words
The structure of claim 1 wherein the fibrous sheet material is comprised of glass fiber.
Claim 2
Dependent Claim
15 words
The structure of claim 1 wherein any such layers contain inert colloidal particles dispersed therein.
Claim 3
Dependent Claim
32 words
The structure of claim 1 wherein the polyimide is a reaction product of benzophenone tetracarboxylic acid dianhydride and metaphenylene diamine or oxydianiline and the inert, thermally stable, colloidal particles are colloidal silica.
Claim 4
Dependent Claim
21 words
The structure of claim 1 having a void volume of not greater than about 7 percent as measured by mercury intrusion.
Claim 5
Dependent Claim
21 words
The structure of claim 1 consisting essentially of one layer consisting essentially of a fibrous sheet material impregnated with a polyimide.
Claim 6
Dependent Claim
32 words
The structure of claim 1 comprising a plurality of layers, at least one of the outermost layers thereof bearing on at least part of at least one of its surfaces a metal.
Claim 7
Dependent Claim
24 words
The structure of claim 7 wherein each outermost face surface of the outermost layers bears on at least part of its surface a metal.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |