US2994723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of tetrafluoroethylene
Assignee: Hoechst AG
•
Filing: 1959-07-20
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Granted: 1961-08-01
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Expires: 1979-07-20
Abstract
No abstract record available.
Inventors
- 👤 Scherer Otto
- 👤 Steimmetz Alfons
- 👤 Kuhn Heinrich
- 👤 Wetzel Walter
- 👤 Grafen Karlheinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:53
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0006; B01J19/0013; C; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/269; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00054; B01J2219/00056; B01J2219/00058; B01J2219/00063; B01J2219/00074; B01J2219/00076; B01J2219/00083; B01J2219/00157; B01J2219/00159
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
IN THE PROCESS FOR THE MANUFACTURE OF TETRAFLUOROETHYLENE BY PYROLYSIS OF DIFLUOROMONOCHLOROMETHANE, THE IMPROVEMENT WHICH COMPRISES PYROLYZING A GASEOUS MIXTURE COMPRISING DIFLUROMONOCHLOROMETHANE AND WATER VAPOR, THE WATER VAPOR BEING PRESENT AS ABOUT 15
Claim 2
Dependent Claim
33 words
IN THE PROCESS FOR THE MANUFACTURE OF TETRAFLUOROETHYLENE BY PYROLYSIS OF DIFLUOROMONOCHLOROMETHANE, THE IMPROVEMENT WHICH COMPRISES PYROLYZING A GASEOUS MIXTURE COMPRISING DIFLUROMONOCHLOROMETHANE AND WATER VAPOR, THE WATER VAPOR BEING PRESENT AS ABOUT 15
References Cited (Backward Citations)
US2551573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |