Patent US2746997A successfully refreshed from Google Patents.
US2746997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cyclohexene fluorocarbons
Assignee: 3M Co
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Filing: 1951-07-27
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Granted: 1956-05-22
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Expires: 1971-07-27
Abstract
No abstract record available.
Inventors
- 👤 Thomas S Reid
- 👤 George H Smith
- 👤 Wilbur H Pearlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:06
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/361; C07C17/363
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE PROCESS WHICH COMPRISES PYROLYZING A FULLY FLUORINATED CYCLIC CARBOXYLIC ACID OF THE CLASS CONSISTING OF PERFLUORO-CYCLOHEXYL CARBOXYLIC ACID (C-C6F11COOH) AND PERFLUORO-METHYLCYCLOHEXYL CARBOXYLIC ACIDS HAVING AT LEAST ONE RING-BONDED TRIFLUOROMETHYL GROUP AND HAVING AT LEAST ONE ONE BETA FLUORINE ATOMS, BY HEATING THE ACID IN VAPOR PHASE AT A TEMPERATURE OF ABOUT 550* C., SO AS TO CAUSE A HIGH-YIELD CONVERSION TO A CYCLIC OLEFINIC FLUOROCARBON COMPOUND HAVING A SINGLE DOUBLE BOND IN A 6CARBON RING, AND RECOVERING THE LATTER.
Claim 2
Dependent Claim
80 words
THE PROCESS WHICH COMPRISES PYROLYZING A FULLY FLUORINATED CYCLIC CARBOXYLIC ACID OF THE CLASS CONSISTING OF PERFLUORO-CYCLOHEXYL CARBOXYLIC ACID (C-C6F11COOH) AND PERFLUORO-METHYLCYCLOHEXYL CARBOXYLIC ACIDS HAVING AT LEAST ONE RING-BONDED TRIFLUOROMETHYL GROUP AND HAVING AT LEAST ONE ONE BETA FLUORINE ATOMS, BY HEATING THE ACID IN VAPOR PHASE AT A TEMPERATURE OF ABOUT 550* C., SO AS TO CAUSE A HIGH-YIELD CONVERSION TO A CYCLIC OLEFINIC FLUOROCARBON COMPOUND HAVING A SINGLE DOUBLE BOND IN A 6CARBON RING, AND RECOVERING THE LATTER.
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) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |