Patent US2909809A successfully refreshed from Google Patents.
US2909809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing electrically insulating foils
Assignee: Bayer AG
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Filing: 1955-08-17
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Granted: 1959-10-27
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Expires: 1975-08-17
Abstract
No abstract record available.
Inventors
- 👤 Engelhardt Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:45
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/302; Y; Y10; Y10S; Y10S264/00; Y10S264/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR THE PRODUCTION OF UNSUPPORTED POLYURETHANE FILMS WHICH COMPRISES APPLYING A POLYHYDROXY COMPOUND AND AN ORGANIC POLYISOCYANATE TO A SUPPORT COMPRISING A METAL LAYER, SAID COMPOUND BEING BROUGHT INTO CONTACT WITH SAID METAL LAYER, AND HEATING THE RESULTING MIXTURE TO EFFECT CHEMICAL REACTION BETWEEN THE SAID COMPONENTS AND FORM A SOLID POLYURETHANE, AND THEREAFTER SEPARATING THE SAID POLYURETHANE FILM FROM THE SAID SUPPORT BY DISSOLVING ONLY THE SURFACE OF THE SUPPORT IN CONTACT WITH THE FILM IN A SOLVENT THEREFOR.
Claim 2
Dependent Claim
82 words
A PROCESS FOR THE PRODUCTION OF UNSUPPORTED POLYURETHANE FILMS WHICH COMPRISES APPLYING A POLYHYDROXY COMPOUND AND AN ORGANIC POLYISOCYANATE TO A SUPPORT COMPRISING A METAL LAYER, SAID COMPOUND BEING BROUGHT INTO CONTACT WITH SAID METAL LAYER, AND HEATING THE RESULTING MIXTURE TO EFFECT CHEMICAL REACTION BETWEEN THE SAID COMPONENTS AND FORM A SOLID POLYURETHANE, AND THEREAFTER SEPARATING THE SAID POLYURETHANE FILM FROM THE SAID SUPPORT BY DISSOLVING ONLY THE SURFACE OF THE SUPPORT IN CONTACT WITH THE FILM IN A SOLVENT THEREFOR.
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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) | 1962-10-26 | 1963-04-27 | 1963-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-26 | 1967-04-27 | 1967-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-26 | 1971-04-27 | 1971-10-27 | $7700.00 | Window Closed / Lapsed |