US4954666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing fluorinated C4 to C6 hydrocarbons and novel cyclic fluorinated hydrocarbons and their use as propellant gas and working fluid for heat pump systems
Assignee: Bayer AG
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Filing: 1989-12-21
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Granted: 1990-09-04
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Expires: 2009-12-21
Abstract
Abstract This invention relates to a process for preparing fluorinated C 4 to C 6 hydrocarbons by catalytically hydrogenating, in the presence of a base, at least partially halogenated olefins. This invention also relates to certain novel cyclic fluorinated C 5 and C 6 hydrocarbons prepared by the process of this invention. This invention further relates to the use of fluorinated C 4 to C 6 hydrocarbons as propellant gas or as working fluid for heat pump systems.
Inventors
- 👤 Dietmar Bielefeldt
- 👤 Albrecht Marhold
- 👤 Michael Negele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:26
CPC Classifications
C; C07; C07C; C07C23/00; C07C23/02; C07C23/08; C07C17/00; C07C17/23; C07C23/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
A compound of the formula ##STR7## wherein the two R f ' groups taken together are --CF 2 --CF 2 --CF 2 --or CH(CF 3 )--CH(CF 3 )--.
Claim 2
Dependent Claim
28 words
A compound of the formula ##STR7## wherein the two R f ' groups taken together are --CF 2 --CF 2 --CF 2 --or CH(CF 3 )--CH(CF 3 )--.
Claim 3
Dependent Claim
9 words
A compound according to claim 1 which is 1,1,2,2,3,3-hexafluorocyclopentane.
Claim 4
Dependent Claim
9 words
A compound according to claim 1 which is 1,2-di(trifluoromethyl)cyclobutane.
References Cited (Backward Citations)
US2436142A
Cited
US2874166A
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US2992279A
Cited
US3316312A
Cited
US3093677A
Cited
US3629326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |