Patent US3304293A successfully refreshed from Google Patents.
US3304293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas phase polymerization of tetrafluoroethylene
Assignee: Honeywell International Inc
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Filing: 1962-03-06
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Granted: 1967-02-14
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Expires: 1982-03-06
Abstract
No abstract record available.
Inventors
- 👤 Fuhrmann Robert
- 👤 Jerolamon David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:58
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS FOR POLYMERIZING TETRAFLUOROETHYLENE, COMPRISING CONTACTING GASEOUS TETRAFLUOROETHYLENE WITH A CATALYST SELECTED FROM THE GROUP CONSISTING OF A MIXTURE OF SILICA GEL HAVING A SURFACE AREA OF AT LEAST 100 SQUARE METERS PER GRAM AND AN AVERAGE PORE DIAMETER OF AT LEAST 40 A. WITH A SALT OF AN OXYACID OF HEXAVALENT CHROMIUM AND A MIXTURE OF SILICA-ALUMINA GEL OF THE ABOVE-DESCRIBED SURFACE AREA AND PORE DIAMETER WITH A SALT OF AN OXYACID OF HEXAVALENT CHROMIUM, THE SUM OF THE WEIGHTS OF ALUMINUM AND CHROMIUM IN SAID CATALYST BEING EQUAL TO ABOUT 1 TO 10% BY WEIGHT BASED ON THE SUM OF THE WEIGHTS OF THE SILICA, ALUMINA AND CHROMIUM-CONTAINING SALTS.
Claim 2
Dependent Claim
112 words
A PROCESS FOR POLYMERIZING TETRAFLUOROETHYLENE, COMPRISING CONTACTING GASEOUS TETRAFLUOROETHYLENE WITH A CATALYST SELECTED FROM THE GROUP CONSISTING OF A MIXTURE OF SILICA GEL HAVING A SURFACE AREA OF AT LEAST 100 SQUARE METERS PER GRAM AND AN AVERAGE PORE DIAMETER OF AT LEAST 40 A. WITH A SALT OF AN OXYACID OF HEXAVALENT CHROMIUM AND A MIXTURE OF SILICA-ALUMINA GEL OF THE ABOVE-DESCRIBED SURFACE AREA AND PORE DIAMETER WITH A SALT OF AN OXYACID OF HEXAVALENT CHROMIUM, THE SUM OF THE WEIGHTS OF ALUMINUM AND CHROMIUM IN SAID CATALYST BEING EQUAL TO ABOUT 1 TO 10% BY WEIGHT BASED ON THE SUM OF THE WEIGHTS OF THE SILICA, ALUMINA AND CHROMIUM-CONTAINING SALTS.
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) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |