Patent US3655863A successfully refreshed from Google Patents.
US3275221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic high vacuum system
Assignee: Varian Medical Systems Inc
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Filing: 1965-05-27
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Granted: 1966-09-27
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Expires: 1985-05-27
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Holce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:56
CPC Classifications
F; F04; F04F; F04F9/00; F04F9/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A VACUUM SYSTEM COMPRISING A DIFFUSION PUMP PROVIDED WITH AN INLET, A MECHANICAL VACUUM PUMP BYPASS CONDUIT COMMUNICATING WITH SAID INLET, A MECHANICAL VACUUM PUMP BACKING CONDUIT COMMUNICATING WITH THE DIFFUSION PUMP, A MECHANICAL VACUUM PUMP COMMUNICATING WITH THE BYPASS AND BACKING CONDUITS, BYPASS VALVE MEANS IN THE BYPASS CONDUIT, BACKING VALVE MEANS IN THE BACKING CONDUIT, ELECTRICALLY ACTUATED DRIVE MEANS OPERATIVELY ENGAGING THE BYPASS AND BACKING VALVE MEANS, VALVE MEANS IN THE DIFFUSION PUMP INLET, ELECTRICALLY ACTUATED DRIVE MEANS OPERATIVELY ENGAGING THE DIFFUSION PUMP INLET VALVE MEANS, AND ELECTRICAL TIMER MEANS OPERATIVELY ASSOCIATED WITH THE BYPASS AND BACKING VALVE DRIVE ACTUATOR MEANS FOR CONTROLLING OPERATION OF THE LATTER TO OPEN AND CLOSE SAID VALVE MEANS ALTERNATELY ON A PREDETERMINED TIME SEQUENCE WHEN THE PRESSURE IN SAID INLET IS ELEVATED ABOVE A PREDETERMINED VALUE.
Claim 2
Dependent Claim
134 words
A VACUUM SYSTEM COMPRISING A DIFFUSION PUMP PROVIDED WITH AN INLET, A MECHANICAL VACUUM PUMP BYPASS CONDUIT COMMUNICATING WITH SAID INLET, A MECHANICAL VACUUM PUMP BACKING CONDUIT COMMUNICATING WITH THE DIFFUSION PUMP, A MECHANICAL VACUUM PUMP COMMUNICATING WITH THE BYPASS AND BACKING CONDUITS, BYPASS VALVE MEANS IN THE BYPASS CONDUIT, BACKING VALVE MEANS IN THE BACKING CONDUIT, ELECTRICALLY ACTUATED DRIVE MEANS OPERATIVELY ENGAGING THE BYPASS AND BACKING VALVE MEANS, VALVE MEANS IN THE DIFFUSION PUMP INLET, ELECTRICALLY ACTUATED DRIVE MEANS OPERATIVELY ENGAGING THE DIFFUSION PUMP INLET VALVE MEANS, AND ELECTRICAL TIMER MEANS OPERATIVELY ASSOCIATED WITH THE BYPASS AND BACKING VALVE DRIVE ACTUATOR MEANS FOR CONTROLLING OPERATION OF THE LATTER TO OPEN AND CLOSE SAID VALVE MEANS ALTERNATELY ON A PREDETERMINED TIME SEQUENCE WHEN THE PRESSURE IN SAID INLET IS ELEVATED ABOVE A PREDETERMINED VALUE.
References Cited (Backward Citations)
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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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |