US3787320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oils resistant to highly reactive chemicals
Assignee: Merck Patent GmbH
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Filing: 1971-02-17
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Granted: 1974-01-22
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Expires: 1991-02-17
Abstract
Abstract Perfluoropolyether lubricating oils resistant to degradation by a variety of corrosive chemicals, including boron trifluoride, sulfur tetrafluoride and uranium hexafluoride, are characterized by being substantially free from components reactive to uranium hexafluoride.
Inventors
- 👤 B Hampel
- 👤 W Herbert
- 👤 D Erdmann
- 👤 I Namenyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:49
CPC Classifications
C; C10; C10M; C10M3/00; C10M2209/00; C10M2209/10; C10M2209/102; C10M2211/00; C10M2211/04; C10M2211/042; C10M2211/06; C10M2213/00; C10M2213/04; C10M2213/06; C10N; C10N2010/00; C10N2010/12; C10N2040/00; C10N2040/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
24 words
A process according to claim 1 wherein the perfluoropolyalkylene oxide is selected from the group consisting of perfluoropolyethylene oxides, perfluoropolypropylene oxides, and mixtures thereof.
Claim 2
Dependent Claim
21 words
A process according to claim 1 wherein the starting perfluoroalkylene oxide has a molecular weight between about 1, 800 and 2,600.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein the perfluoropolyethers are treated with gaseous uranium hexafluoride.
Claim 4
Dependent Claim
21 words
A process according to claim 1 wherein the perfluoropolyethers are treated under pressure with uranium hexafluoride in a sealed reaction vessel.
Claim 5
Dependent Claim
46 words
Lubricating oils resistant to highly reactive chemicals consisting essentially of perfluoroalkylene oxides of a molecular weight of between about 1,000 and 4,000 whose alkylene groups each are of 1-4 carbon atoms, substantially free from uranium hexafluoride reactive components, produced according to the process of claim 9.
Claim 6
Dependent Claim
25 words
A lubricating oil according to claim 6 wherein the perfluoropolyalkylene oxide is selected from the group consisting of perfluoropolyethylene oxides, perfluoropolypropylene oxides, and mixtures thereof.
Claim 7
Dependent Claim
17 words
A lubricating oil according to claim 6 having a molecular weight range between about 1,800 and 2,600.
Claim 8
Dependent Claim
17 words
A lubricating oil according to claim 6 having a viscosity of about 20-300 centistokes at 20* C.
Claim 9
Dependent Claim
22 words
A lubricating oil according to claim 6 having a vapor pressure of 10 4 to 10 7 mm. Hg at 20* C.
Claim 10
Dependent Claim
32 words
A lubricating oil according to claim 6 having a viscosity of about 20-300 centistokes at 20* C. and a vapor pressure of 10 4 to 10 7 mm. Hg at 20* C.
Claim 11
Dependent Claim
45 words
A lubricating oil according to claim 6 selected from the group consisting of perfluoropolyethylene oxides, perfluoropolypropylene oxides and mixtures thereof, having a viscosity of about 20-300 centistokes at 20* C. and a vapor pressure of 10 4 to 10 7 mm. Hg at 20* C.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |