Patent US892472A successfully refreshed from Google Patents.
Patent US2997448A successfully refreshed from Google Patents.
US2997448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded fluorocarbon polymer product and method of preparing same
Assignee: EIDP Inc
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Filing: 1958-09-24
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Granted: 1961-08-22
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Expires: 1978-09-24
Abstract
No abstract record available.
Inventors
- 👤 Hochberg Jerome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:02
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B24/00; C04B24/24; C04B24/26; C04B24/2682; C04B38/00; C04B38/04; C04B40/00; C04B40/0092; C04B41/53; C08; C08K; C08K3/00; C08K3/01; C08K3/013; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
132 words
THE PROCESS OF MOLDING SHAPED ARTICLES DIRECTLY FROM AN AQUEOUS DISPERSION OF A FLUOROCARBON POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYTETRAFLUOROETHYLENE, POLYVINYL FLUORIDE, POLYMONOCHLOROTRIFLUOROETHYLENE, COPOLYMER OF 95-50% TETRAFLUOROETHYLENE AND 5-50% HEXAFLUOROPROPENE, AND COPOLYMER OF 70-30% VINYLIDENE FLUORIDE AND 30-70% HEXAFLUOROPROPENE, WHICH COMPRISES MIXING WITH SAID DISPERSION A PARTICULATE UNHYDRATED HYDRAULIC CEMENT SELECTED FROM THE CLASS CONSISTING OF PLASTER OF PARIS, PORTLAND CEMENT AND SOREL CEMENT, THE WEIGHT RATIO OF FLUOROCARBON POLYMER TO HYDRAULIC CEMENT VARYING BETWEEN 20 TO 80 PARTS BY WEIGHT OF THE FORMER AND 80 TO 20 PARTS BY WEIGHT OF THE LATTER, ALLOWING SAID MIXTURE TO SET TO THE SOLID STATE AT ATMOSPHERIC PRESSURE IN A MOLD, REMOVING THE RESULTANT MOLDED ARTICLE FROM SAID MOLD AND HEATING SAID MOLDED ARTICLE TO THE FUSION TEMPERATURE OF SAID FLUOROCARBON POLYMER.
Claim 2
Dependent Claim
132 words
THE PROCESS OF MOLDING SHAPED ARTICLES DIRECTLY FROM AN AQUEOUS DISPERSION OF A FLUOROCARBON POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYTETRAFLUOROETHYLENE, POLYVINYL FLUORIDE, POLYMONOCHLOROTRIFLUOROETHYLENE, COPOLYMER OF 95-50% TETRAFLUOROETHYLENE AND 5-50% HEXAFLUOROPROPENE, AND COPOLYMER OF 70-30% VINYLIDENE FLUORIDE AND 30-70% HEXAFLUOROPROPENE, WHICH COMPRISES MIXING WITH SAID DISPERSION A PARTICULATE UNHYDRATED HYDRAULIC CEMENT SELECTED FROM THE CLASS CONSISTING OF PLASTER OF PARIS, PORTLAND CEMENT AND SOREL CEMENT, THE WEIGHT RATIO OF FLUOROCARBON POLYMER TO HYDRAULIC CEMENT VARYING BETWEEN 20 TO 80 PARTS BY WEIGHT OF THE FORMER AND 80 TO 20 PARTS BY WEIGHT OF THE LATTER, ALLOWING SAID MIXTURE TO SET TO THE SOLID STATE AT ATMOSPHERIC PRESSURE IN A MOLD, REMOVING THE RESULTANT MOLDED ARTICLE FROM SAID MOLD AND HEATING SAID MOLDED ARTICLE TO THE FUSION TEMPERATURE OF SAID FLUOROCARBON POLYMER.
Claim 3
Dependent Claim
45 words
THE PROCESS OF CLAIM 1 WHICH COMPRISES THE ADDITIONAL STEP OF EXTRACTING THE SET HYDRAULIC CEMENT FROM SAID MOLDED ARTICLE AFTER SAID FUSING STEP BY IMMERSING SAID ARTICLE IN A LIQUID WHICH DISSOLVES SAID SET HYDRAULIC CEMENT AND WASHING THE SOLUBLIZED CEMENT FROM SAID ARTICLE.
References Cited (Backward Citations)
US2089813A
Cited
US2256483A
Cited
US2384611A
Cited
US2400091A
Cited
US2592147A
Cited
US2613193A
Cited
US2819209A
Cited
US2806256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |