US3770566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interdiffusionally bonded structures of polyimide and fluoropolymer
Assignee: EIDP Inc
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Filing: 1971-06-08
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Granted: 1973-11-06
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Expires: 1991-06-08
Abstract
Abstract Laminar film structures comprising polyimide interdiffusionally bonded to FEP fluorocarbon and a process for the preparation of these laminates comprising coating an organic or aqueous dispersion of FEP fluorocarbon onto a polyamide acid film and subsequently heating to convert the coated polyamide acid to polyimide.
Inventors
- 👤 C Gerow
- 👤 J Sparapany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:21
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/052; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/28; B32B27/281; B32B27/32; B32B27/322; C08J7/0427; C08J7/043; B32B2379/00; B32B2379/08; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; C08J2479/00; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/266; Y10T428/31504; Y10T428/3154; Y10T428/31721
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
A film structure of claim 1 wherein R is selected from phenylene, naphthylene, biphenylene, anthrylene, furylene, benzfurylene, and
Claim 2
Dependent Claim
31 words
A laminar structure of claim 1 wherein the polymer chains of the FEP fluoropolymer and the polyimide are both interdiffused throughout an interface having a thickness of at least 25 angstroms.
Claim 3
Dependent Claim
20 words
A laminar structure of claim 1 wherein the FEP fluoropolymer layer has a thickness of at least about 0.05 mil.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |