US2642625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing thin polytetrahaloethylene films
Assignee: Sprague Electric Co
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Filing: 1950-06-23
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Granted: 1953-06-23
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Expires: 1970-06-23
Abstract
No abstract record available.
Inventors
- 👤 David B Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:18
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/18; C; C08; C08J; C08J5/00; C08J5/18; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2105/00; B29K2105/06; B29K2105/16; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10S; Y10S264/00; Y10S264/68; Y10S264/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A PROCESS FOR PRODUCING POLYTETRAFLUOROETHYLENE FILMS CONTAINING CERAMIC PARTICLES SUBSTANTIALLY LESS THAN 1 MIL. IN THICKNESS WHICH COMPRISES STRETCHING A FILM OF SAID RESIN CONTAINING CERAMIC PARTICLES OF ABOUT 2 MILS. THICKNESS IN A SINGLE DIRECTION TO A LENGTH OF AT LEAST ABOUT TWICE THE ORIGINAL LENGTH IN SAID DIRECTION AND PASSING SAID STRETCHED FILM THROUGH HIGH PRESSURE CALENDER ROLLS WHOSE AXES ARE PERPENDICULAR TO THE DIRECTION OF SAID STRETCHING AND WHICH ARE MAINTAINED AT AN AMBIENT TEMPERATURE SUFFICIENT TO MAINTAIN THE RESIN FILM AT THE POINT
Claim 2
Dependent Claim
87 words
A PROCESS FOR PRODUCING POLYTETRAFLUOROETHYLENE FILMS CONTAINING CERAMIC PARTICLES SUBSTANTIALLY LESS THAN 1 MIL. IN THICKNESS WHICH COMPRISES STRETCHING A FILM OF SAID RESIN CONTAINING CERAMIC PARTICLES OF ABOUT 2 MILS. THICKNESS IN A SINGLE DIRECTION TO A LENGTH OF AT LEAST ABOUT TWICE THE ORIGINAL LENGTH IN SAID DIRECTION AND PASSING SAID STRETCHED FILM THROUGH HIGH PRESSURE CALENDER ROLLS WHOSE AXES ARE PERPENDICULAR TO THE DIRECTION OF SAID STRETCHING AND WHICH ARE MAINTAINED AT AN AMBIENT TEMPERATURE SUFFICIENT TO MAINTAIN THE RESIN FILM AT THE POINT
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) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |