US3626760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leak detection cyclic pumping control
Assignee: Varian Medical Systems Inc
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Filing: 1969-07-16
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Granted: 1971-12-14
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Expires: 1989-07-16
Abstract
Abstract MASS SPECTROMETER LEAK DETECTOR (OR VACUUM APPARATUS) GENERALLY CONTROLLED IN ITS PUMPING CYCLES BY SOLENOID OPERATED ROUGHING AND ISOLATION VALVES AND UTILIZING ROUGHING LINE SUCTION FOR EFFECTIVE OPERATION OF THE ROUGHING VALVE IN OPENING AND SEALING. THE ROUGHING VALVE IS ALSO USED FOR TEST PORT AIR RELEASE IN CONJUNCTION WITH SEALING OF THE ROUGHING VALVE PER SE. AUTOMATIC, PRESSURERESPONSIVE, CONTROL OF THE SYSTEM IS PROVIDED TO ALLOW COMPLETE CONTROL OF PUMP-DOWN, TEST AIR RELEASE AND STAND-BY PHASES OF A SINGLE CYCLE USING A SINGLE ELECTRICAL SWITCH.
Inventors
- 👤 Walton E Briggs
- 👤 Paul R Fruzzetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:59
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/202
Claims Analysis
Total Claims: 0
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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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |