US3637871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyfluorotricycloalkenes
Assignee: 3M Co
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Filing: 1970-02-04
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Granted: 1972-01-25
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Expires: 1990-02-04
Abstract
Abstract POLYFLUOROTRICYCLOALKENES HAVING THE FORMULA: 1,2-(-(CF2)N-),3,4-(-(CF2)N-),5,6-(-(CF2)N-)BENZENE WHEREIN N IS 2, 3, OR 4 ARE PREPARED BY SUBJECTING CERTAIN FLUOROALICYCLIC HALIDE COMPOUNDS TO HIGH TEMPERATURE IN THE PRESENCE OF METALLIC COPPER. THE COMPOUNDS ARE USEFUL AS CRYOGENIC LUBRICANTS IN EQUIPMENT INTENDED FOR THE PREPARATION AND USE OF LIQUID OXYGEN.
Inventors
- 👤 Joseph D Park
- 👤 Sam Kwon Choi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:12
CPC Classifications
C; C10; C10M; C10M3/00; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/269; C07C23/00; C07C23/18; C07C23/20; C07C23/46; C10M2211/00; C10M2211/02; C10N; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50; C10N2050/00; C10N2050/10
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |