US3605554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid control safety system
Assignee: Robertshaw Controls Co
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Filing: 1970-03-05
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Granted: 1971-09-20
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Expires: 1990-03-05
Abstract
Abstract A FLUID CONTROL SYSTEM UTILIZED IN CONJUNCTION WITH A PAIR OF MANUALLY OPERATED FLUID VALVES SO SPACED AS TO NECESSITATE THE USE OF BOTH HANDS BY AN OPERATOR FOR CAUSING ACTUATION OF A FLUID MOTOR, SUCH AS A HYDRAULIC PRESS. THE TWO MANUALLY OPERATED VALVES SELECTIVELY APPLY PRESSURIZED FLUID TO A PAIR OF FLUID LINES WHICH ARE CONNECTED TO A MAIN FLOW VALVE AND A PAIR OF CONTROL VALVES. THE CONTROL VALVES ARE CONNECTED THROUGH A PRESSURE STORAGE NETWORK TO THE MAIN FLOW VALVE FOR PREVENTING ACTUATION OF THE MAIN FLOW VALVE IN THE EVENT THAT BOTH OF THE MANUALLY OPERABLE VALVES ARE NOT ACTUATED WITHIN A PRESET TIME INTERVAL.
Inventors
- 👤 Daniel Philbrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:50
CPC Classifications
F; F16; F16P; F16P3/00; F16P3/18; F16P3/22
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |