US3587395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic control system and parts therefor or the like
Assignee: Robertshaw Controls Co
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Filing: 1968-04-08
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Granted: 1971-06-28
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Expires: 1988-04-08
Abstract
Abstract THIS DISCLOSURE RELATES TO A VACUUM TEMPERATURE CONTROL SYSTEM WHEREIN A PAIR OF VACUUM SIGNALS RESPECTIVELY FROM A TEMPERATURE SENSOR AND A TEMPERATURE SELECTING MEANS ARE TRANSLATED BY A COMPARATOR INTO A VACUUM CONTROL SIGNAL THAT OPERATES A TEMPERATURE OUTPUT MEANS FOR THE SYSTEM IN RELATION TO THE VACUUM CONTROL SIGNAL TO PRODUCE A PROPORTIONAL ACTION THEREOF, THE SYSTEM, HOWEVER, HAVING VACUUM SIGNAL MEANS FOR RESETTING THE COMPARATOR TO SLOWLY ELIMINATE THE PROPORTIONAL ACTION CAUSED BY THE COMPARATOR.
Inventors
- 👤 Larry V Nisley
- 👤 Klaus P Mueller
- 👤 Kenneth G Kreuter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:23
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/185; F; F15; F15C; F15C3/00; F15C3/04
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |