Patent US3698515A successfully refreshed from Google Patents.
US3698515A
Expired / Lapsed
US
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Vacuum pump lubrication system
Assignee: SPX Technologies Inc
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Filing: 1970-12-21
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Granted: 1972-10-17
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Expires: 1990-12-21
Abstract
Abstract An oil-sealed, mechanical vacuum pump is provided with a scheme for reducing re-entrainment of oil in the gas stream passing through the oil separator of the pump. The scheme comprises check valve means located in the gravity feed lubrication circuit leading from the separator to the pump bearings and which serves to prevent reverse flow of gas into the separator during operation of the pump at high inlet pressures. This measure prevents agitation of the stored oil in the separator, and consequently reduces the risk of re-entrainment resulting from splashing.
Inventors
- 👤 Zbigniew C Dobrowolski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:52
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/02; F04C29/026; F04C27/00; F04C27/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
In an oil-sealed, mechanical vacuum pump (11) including a discharge pipe (15) leading from a working space to an elevated separator (14) wherein oil is separated from pumped gas and stored, and a gravity feed lubrication system (23-26) serving to load stored oil from the separator (14) to the working space through a bearing of the pump, the improvement which comprises check valve means (27) located in said lubrication system and arranged to permit flow from, but not into, the separator.
Claim 2
Dependent Claim
81 words
In an oil-sealed, mechanical vacuum pump (11) including a discharge pipe (15) leading from a working space to an elevated separator (14) wherein oil is separated from pumped gas and stored, and a gravity feed lubrication system (23-26) serving to load stored oil from the separator (14) to the working space through a bearing of the pump, the improvement which comprises check valve means (27) located in said lubrication system and arranged to permit flow from, but not into, the separator.
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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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |