Patent US4225288A successfully refreshed from Google Patents.
US4225288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump set comprising a liquid ring vacuum pump preceeded by a compressor
Assignee: Siemens AG
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Filing: 1975-06-09
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Granted: 1980-09-30
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Expires: 1995-06-09
Abstract
Abstract A pump set comprising a compressor followed by a liquid ring vacuum pump with the two pumps matched to each other so that a relatively small liquid ring vacuum pump can draw and maintain vacuum under 40 Torr.
Inventors
- 👤 Kurt Mugele
- 👤 Bodo Nagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:11
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/007; F04B41/00; F04B41/06; F04B49/20; F04B49/22; F04B49/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
Apparatus for suctioning off and compressing compressible medium below 100 Torr suction pressure comprising: (a) a side channel ring compressor having its input coupled to a space from which the media is to be suctioned off; (b) a liquid ring vacuum having its input coupled to the output of said side channel ring compressor, the suction capacity of said liquid ring vacuum pump being designed for the pressure ratio obtainable by said side channel ring compressor.
Claim 2
Dependent Claim
76 words
Apparatus for suctioning off and compressing compressible medium below 100 Torr suction pressure comprising: (a) a side channel ring compressor having its input coupled to a space from which the media is to be suctioned off; (b) a liquid ring vacuum having its input coupled to the output of said side channel ring compressor, the suction capacity of said liquid ring vacuum pump being designed for the pressure ratio obtainable by said side channel ring compressor.
Claim 3
Dependent Claim
31 words
Apparatus according to claim 1 and further including means to prevent an inadmissible increase of the power consumption of the side channel ring compressor when said ring compressor is turned on.
Claim 4
Dependent Claim
30 words
Apparatus according to claim 2 wherein said means to control the speed of the drive comprise means to switch the drive of said side channel ring compressor on and off.
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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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |