Patent US2983764A successfully refreshed from Google Patents.
US2983764A
Expired / Lapsed
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Process for the preparation of fluorocarbon compounds
Assignee: EIDP Inc
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Filing: 1959-08-31
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Granted: 1961-05-09
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Expires: 1979-08-31
Abstract
No abstract record available.
Inventors
- 👤 Knaack Donald Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:13
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/272; C07C17/278; C07C17/281
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
PROCESS FOR THE PREPARATION OF FLUOROCARBON SOLVENTS WHICH COMPRISES CONTACTING HEXAFLUOROPROPYLENE AT A TEMPERATURE OF 0 TO 250*C. WITH CATALTIC AMOUNTS OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF TETRAKIS (DIMETHYLAMINO) ETHYLENE AND TETRAMETHYLGUANIDINE, AND RECOVERING A MIXTURE OF INTERNALLY UNSATURATED, LINEAR DIMERS AND TRIMERS OF HEXAFLUOROPROPYLENE.
Claim 2
Dependent Claim
48 words
PROCESS FOR THE PREPARATION OF FLUOROCARBON SOLVENTS WHICH COMPRISES CONTACTING HEXAFLUOROPROPYLENE AT A TEMPERATURE OF 0 TO 250*C. WITH CATALTIC AMOUNTS OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF TETRAKIS (DIMETHYLAMINO) ETHYLENE AND TETRAMETHYLGUANIDINE, AND RECOVERING A MIXTURE OF INTERNALLY UNSATURATED, LINEAR DIMERS AND TRIMERS OF HEXAFLUOROPROPYLENE.
References Cited (Backward Citations)
US2691036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |