US3967018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of surface treatment of polytetrafluoroethylene
Assignee: Czech Academy of Sciences
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Filing: 1974-09-30
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Granted: 1976-06-29
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Expires: 1994-09-30
Abstract
Abstract A technique is described for treating polytetrafluoroethylene surfaces with an amalgam of an alkaline metal to alter the surface thereof chemically and/or physically.
Inventors
- 👤 Jiri Jansta
- 👤 Frantisek Dousek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:13
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
53 words
A technique for treating the surface of polytetrafluoroethylene which comprises immersing the polytetrafluoroethylene in an alloy selected from the group consisting of (a) mercury and an alkali metal and (b) mercury and an alkali metal in combination with an alloy of mercury and an alkaline earth metal at a temperature less than 300°C.
Claim 2
Dependent Claim
53 words
A technique for treating the surface of polytetrafluoroethylene which comprises immersing the polytetrafluoroethylene in an alloy selected from the group consisting of (a) mercury and an alkali metal and (b) mercury and an alkali metal in combination with an alloy of mercury and an alkaline earth metal at a temperature less than 300°C.
Claim 3
Dependent Claim
29 words
Technique in accordance with claim 1 wherein said surface is immersed in a mixture of an alloy of an alkali metal and an amalgam of an alkaline earth metal.
Claim 4
Dependent Claim
17 words
Technique in accordance with claim 1 wherein said alloy is a saturated solution of lithium in mercury.
Claim 5
Dependent Claim
17 words
Technique in accordance with claim 1 wherein said alloy is a saturated solution of sodium in mercury.
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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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |