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US4452716A
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Mixed trialkylphosphine oxides as functional fluids
Assignee: FMC Corp
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Filing: 1982-12-20
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Granted: 1984-06-05
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Expires: 2002-12-20
Abstract
Abstract Low density hydraulic fluids, in which the base stock is a tri(C 6 -C 8 -C 10 ) alkylphosphine oxide are described.
Inventors
- 👤 Richard W. Cummins
- 👤 Burton M. Baum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:54
CPC Classifications
C; C10; C10M; C10M105/00; C10M105/74; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/53; C07F9/5304; C10M2223/00; C10M2223/06; C10M2223/061; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
96 words
A hydraulic fluid which comprises as the base stock, 95% to 99.99% by weight of a liquid mixed trialkylphosphine oxide wherein the alkyls are C 6 to C 10 , said trialkylphosphine oxide being obtained by phosphinating, in the presence of a free radical initiator, a mixture of the corresponding alpha olefin with phosphine in a molar ratio of 3 to 1 to form a mixed trialkylphosphine followed by oxidation of said mixed trialkylphosphine to the corresponding phosphine oxide and in admixture with the base stock about 0.01% to 5.0% by weight of hydraulic fluid additives.
Claim 2
Dependent Claim
96 words
A hydraulic fluid which comprises as the base stock, 95% to 99.99% by weight of a liquid mixed trialkylphosphine oxide wherein the alkyls are C 6 to C 10 , said trialkylphosphine oxide being obtained by phosphinating, in the presence of a free radical initiator, a mixture of the corresponding alpha olefin with phosphine in a molar ratio of 3 to 1 to form a mixed trialkylphosphine followed by oxidation of said mixed trialkylphosphine to the corresponding phosphine oxide and in admixture with the base stock about 0.01% to 5.0% by weight of hydraulic fluid additives.
Claim 3
Dependent Claim
30 words
A hydraulic fluid according to claim 1 wherein the mixed trialkylphosphine oxide contains approximately equal molar ratios of alkyls selected from the class consisting essentially of hexyl, octyl and decyl.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |