Patent US2938889A successfully refreshed from Google Patents.
US2938889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of tetrafluoroethylene with selected metal fluorides
Assignee: EIDP Inc
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Filing: 1957-06-12
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Granted: 1960-05-31
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Expires: 1977-06-12
Abstract
No abstract record available.
Inventors
- 👤 Krespan Carl George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:46
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR PREPARING PERFLUOROCARBON POLYMER WHICH COMPRISES CONTACTING UNDER ANHYDROUS CONDITIONS AT A TEMPERATURE OF AT LEAST 0*C. UNDER A PRESSURE OF AT LEAST ONE ATMOSPHERE, (A) MONOMERIC TERMINALLY UNSATURATED PERFLUOROOLEFIN COMPRISING AT LEAST 20 MOLE PER CENT TETRAFLUOROETHYLENE, AND (B) A CATALYTIC AMOUNT OF METAL FLUORIDE, SAID METAL BEING ONE HAVING A HIGHER OXIDATIVE POTENTIAL THAN MERCURY, SELECTED FROM THE GROUP CONSISTING OF CHROMIUM, MANGANESE, CERIUM, LEAD, BISMUTH, COBALT AND SILVER, AND BEING PRESENT IN ITS HIGHEST VALENCY STATE.
Claim 2
Dependent Claim
81 words
A PROCESS FOR PREPARING PERFLUOROCARBON POLYMER WHICH COMPRISES CONTACTING UNDER ANHYDROUS CONDITIONS AT A TEMPERATURE OF AT LEAST 0*C. UNDER A PRESSURE OF AT LEAST ONE ATMOSPHERE, (A) MONOMERIC TERMINALLY UNSATURATED PERFLUOROOLEFIN COMPRISING AT LEAST 20 MOLE PER CENT TETRAFLUOROETHYLENE, AND (B) A CATALYTIC AMOUNT OF METAL FLUORIDE, SAID METAL BEING ONE HAVING A HIGHER OXIDATIVE POTENTIAL THAN MERCURY, SELECTED FROM THE GROUP CONSISTING OF CHROMIUM, MANGANESE, CERIUM, LEAD, BISMUTH, COBALT AND SILVER, AND BEING PRESENT IN ITS HIGHEST VALENCY STATE.
References Cited (Backward Citations)
US2549935A
Cited
US2569524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |