US3770573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interdiffusionally bonded structures of polyimide polymeric material
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 of layers of polyimide polymeric material interdiffusionally bonded together, including structures having one non-heat-sealable polyimide layer interdiffusionally bonded to a heat-sealable polyimide layer; the structures being useful in the form of narrow tapes for electrical insulation purposes such as wrapping electrical conductors.
Inventors
- 👤 J Dunphy
- 👤 J Kreuz
- 👤 D Roper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:26
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/052; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/28; B32B27/281; C08J7/0427; C08J7/043; B32B2307/00; B32B2307/30; B32B2307/31; B32B2379/00; B32B2379/08; C08J2379/00; C08J2379/04; C08J2379/08; C08J2479/00; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
31 words
An article of claim 1 wherein a stratum of the polyimide of formula (1) is interdiffusionally bonded to a stratum of heat-sealable polyimide having the repeating structural unit of formula (2):
Claim 2
Dependent Claim
36 words
An article of claim 1 wherein a stratum of non-heat-sealable polyimide having the repeating structural unit of formula (1) is interdiffusionally bonded to a stratum of heat-sealable polyimide having the repeating structural unit of formula (2).
Claim 3
Dependent Claim
14 words
An article of claim 1 having a thickness of at least about 1 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 |