US2569524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of trifluorochloroethylene in the presence of silver ion, bisulfite ion and persulfate
Assignee: EIDP Inc
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Filing: 1949-06-16
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Granted: 1951-10-02
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Expires: 1969-06-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Jefferson M Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:41
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/24; Y; Y10; Y10S; Y10S526/00; Y10S526/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
THE PROCESS FOR MAKING POLYMERS WHICH COMPRISES AGITATING A MEMBER OF THE GROUP CONSISTING OF MONOMERIC CHLOROTRIFLUOROETHYLENE AND MIXTURES OF MONOMERIC CHLOROTRIFLUOROETHYLENE AND MONOMERIC TETRAFLUORETHYLENE CONTAINING AT LEAST 40% CHLOROTRIFLUOROETHYLENE AT A TEMPERATURE OF FROM ABOUT 20* C. TO 60* C. IN A CLOSED VESSEL UNDER A PRESSURE OF AT LEAST 60 POUNDS PER SQUARE INCH IN THE PRESENCE OF AN AQUEOUS CATALYST SYSTEM COMPOSED ESSENTIALLY OF WATER, ABOUT 0.5% TO ABOUT 1% OF AN INORGANIC ALKALI PERSULFATE, ABOUT 0.1% TO ABOUT 0.2% OF AN INORGANIC ALKALI BISULFITE AND ABOUT 0.01% TO ABOUT 1% OF SILVER ADDED AS AN INORGANIC SILVER SALT HAVING A SOLUBILITY IN WATER AT LEAST EQUAL TO THAT OF SILVER PHOSPHATE AND IN THE ABSENCE OF MORE THAN 10 PARTS PER MILLION OF C2, AND SEPARATING THE POLYMER FROM THE REACTION MIXUTRE.
Claim 2
Dependent Claim
136 words
THE PROCESS FOR MAKING POLYMERS WHICH COMPRISES AGITATING A MEMBER OF THE GROUP CONSISTING OF MONOMERIC CHLOROTRIFLUOROETHYLENE AND MIXTURES OF MONOMERIC CHLOROTRIFLUOROETHYLENE AND MONOMERIC TETRAFLUORETHYLENE CONTAINING AT LEAST 40% CHLOROTRIFLUOROETHYLENE AT A TEMPERATURE OF FROM ABOUT 20* C. TO 60* C. IN A CLOSED VESSEL UNDER A PRESSURE OF AT LEAST 60 POUNDS PER SQUARE INCH IN THE PRESENCE OF AN AQUEOUS CATALYST SYSTEM COMPOSED ESSENTIALLY OF WATER, ABOUT 0.5% TO ABOUT 1% OF AN INORGANIC ALKALI PERSULFATE, ABOUT 0.1% TO ABOUT 0.2% OF AN INORGANIC ALKALI BISULFITE AND ABOUT 0.01% TO ABOUT 1% OF SILVER ADDED AS AN INORGANIC SILVER SALT HAVING A SOLUBILITY IN WATER AT LEAST EQUAL TO THAT OF SILVER PHOSPHATE AND IN THE ABSENCE OF MORE THAN 10 PARTS PER MILLION OF C2, AND SEPARATING THE POLYMER FROM THE REACTION MIXUTRE.
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) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |