US3572212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for hydraulic ventilator drives
Assignee: SUDDEUTSCHE KUHLERFABRIK FR BE
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Filing: 1969-03-12
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Granted: 1971-03-23
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Expires: 1989-03-12
Abstract
Abstract A CONTROL MEANS HYDRAULIC VENTILATOR DRIVES ESPECIALLY FOR REGULATING THE TEMPERATURE OF THE COOLING FLUID BY MEANS OF A CONTROLLED VENTILATOR REGULATOR AND AN EXCESS PRESSURE VALVE AND MEANS FOR AUTOMATICALLY CHANGING THE PRESSURE AT WHICH THE EXCESS VALVE RESPONDS TO THE BACK PRESSURE IN THE OPERATING FLUID CIRCUIT THAT DEPENDS ON THE SPEED OR RATE OF TRAVEL, WHICH MEANS IS PRIMARILY INTENDED FOR VENTILATORS IN BRANCH CIRCUITS AND INCLUDES A VALVE ARRANGEMENT, SUCH AS MAGNETIC VALVE MEANS FOR OPTIONALLY CONNECTING OR DISCONNECTING THE BACK PRESSURE.
Inventors
- 👤 Franz Pigisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:18
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02; F01P7/04; F01P7/044; Y; Y10; Y10S; Y10S60/00; Y10S60/912
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |