US3347737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing surface
Assignee: EIDP Inc
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Filing: 1966-08-18
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Granted: 1967-10-17
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Expires: 1986-08-18
Abstract
No abstract record available.
Inventors
- 👤 Edward F Harford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:03
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/20; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2911; Y10T428/2913; Y10T442/00; Y10T442/50; Y10T442/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A BEARING SURFACE COMPRISING AN AIR-PERVIOUS FIBROUS NONWOVEN SHEET ADHESIVELY BONDED TO A RIGID SUPPORT BY A BINDER HARDENED IN THE INTERSTICES IN THE SAID SHEET, SAID SHEET CONSISTING ESSENTIALLY OF FROM ABOUT 50-100% BY WEIGHT OF FIBERS OF A POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYTETRAFLUOROETHYLENE, POLYHEXAFLUOROPROPYLENE, POLYCHLOROTRIFLUOROETHYLENE, AND TETRAFLUOROETHYLENE/ CHLOROTRIFLUOROETHYLENE INTERPOLYMER AND UP TO ABOUT 50% BY WEIGHT OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ASBESTOS FIBERS, GLASS FIBERS, ROCK WOOK, AND FLAKE MICA, THE COMPONENTS OF THE SAID SHEET BEING RANDOMLY INTERMINGLED IN MULTICONTACT RELATIONSHIP, WITH AT LEAST SOME OF THE FIBERS BEING BONDED AT THE CONTACT POINTS BY PORTIONS OF THE ORGANIC POLYMERIC FIBERS WHICH HAVE BEEN SINTERED BY HEATING SAID SHEETS TO BETWEEN ABOUT 350*C. AND 370*C.
Claim 2
Dependent Claim
125 words
A BEARING SURFACE COMPRISING AN AIR-PERVIOUS FIBROUS NONWOVEN SHEET ADHESIVELY BONDED TO A RIGID SUPPORT BY A BINDER HARDENED IN THE INTERSTICES IN THE SAID SHEET, SAID SHEET CONSISTING ESSENTIALLY OF FROM ABOUT 50-100% BY WEIGHT OF FIBERS OF A POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYTETRAFLUOROETHYLENE, POLYHEXAFLUOROPROPYLENE, POLYCHLOROTRIFLUOROETHYLENE, AND TETRAFLUOROETHYLENE/ CHLOROTRIFLUOROETHYLENE INTERPOLYMER AND UP TO ABOUT 50% BY WEIGHT OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ASBESTOS FIBERS, GLASS FIBERS, ROCK WOOK, AND FLAKE MICA, THE COMPONENTS OF THE SAID SHEET BEING RANDOMLY INTERMINGLED IN MULTICONTACT RELATIONSHIP, WITH AT LEAST SOME OF THE FIBERS BEING BONDED AT THE CONTACT POINTS BY PORTIONS OF THE ORGANIC POLYMERIC FIBERS WHICH HAVE BEEN SINTERED BY HEATING SAID SHEETS TO BETWEEN ABOUT 350*C. AND 370*C.
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |