Patent US3325787A successfully refreshed from Google Patents.
US3097990A
Expired / Lapsed
US
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Polytetrafluoroethylene saturated crocidolite fiber product
Assignee: Armstrong World Industries Inc
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Filing: 1961-01-16
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Granted: 1963-07-16
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Expires: 1981-01-16
Abstract
No abstract record available.
Inventors
- 👤 Richard B Holly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/35; D21H13/00; D21H13/36; D21H13/38; D21H13/42; D21H17/63; D21H17/66; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944; Y10S277/945; Y10S277/946; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR OBTAINING FIBROUS STRUCTUTES IMPREGNATED WITH TETRAFLOROETHYLENE POLYMER, WHICH COMPRISES FORMING A SLURRY WITH A WATER SOLUTION OF ALUM, DEPOSITING A FORING A SLURRY OF CROCIDOLITE ASBESTOS FIBERS, TREATING SYNTHETIC RUBBER BINDER ON SAID FIBERS IN THE RANGE OF FROM 2-15% BY WEIGHT OF RUBBER BASED ON THE WEIGHT OF THE FIBERS, FORMING A SHEET FROM SAID RUBBER-COATED FIBERS, DRYING SAID SHEET, AND IMMERSING SAID SHEET IN AN AQUEOUS COLLOIDAL DISPERSION OF TETRAFLUOROETHYLENE POLYMER FOR A PERIOD OF TIME SUFFICIENT TO UNIFORMLY DISPERSE AND DEPOSIT THE SATURANT THROUGHOUT THE SHEET, AND DRYING THE SHEET.
Claim 2
Dependent Claim
96 words
A PROCESS FOR OBTAINING FIBROUS STRUCTUTES IMPREGNATED WITH TETRAFLOROETHYLENE POLYMER, WHICH COMPRISES FORMING A SLURRY WITH A WATER SOLUTION OF ALUM, DEPOSITING A FORING A SLURRY OF CROCIDOLITE ASBESTOS FIBERS, TREATING SYNTHETIC RUBBER BINDER ON SAID FIBERS IN THE RANGE OF FROM 2-15% BY WEIGHT OF RUBBER BASED ON THE WEIGHT OF THE FIBERS, FORMING A SHEET FROM SAID RUBBER-COATED FIBERS, DRYING SAID SHEET, AND IMMERSING SAID SHEET IN AN AQUEOUS COLLOIDAL DISPERSION OF TETRAFLUOROETHYLENE POLYMER FOR A PERIOD OF TIME SUFFICIENT TO UNIFORMLY DISPERSE AND DEPOSIT THE SATURANT THROUGHOUT THE SHEET, AND DRYING THE SHEET.
References Cited (Backward Citations)
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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) | 1966-07-15 | 1967-01-14 | 1967-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-15 | 1971-01-14 | 1971-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-15 | 1975-01-14 | 1975-07-16 | $7700.00 | Window Closed / Lapsed |