US3213875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic changeover system
Assignee: Spence Engineering Co Inc
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Filing: 1962-02-21
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Granted: 1965-10-26
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Expires: 1982-02-21
Abstract
No abstract record available.
Inventors
- 👤 Leon B Dexter
- 👤 Otto C Paulsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:33
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/14; G05D16/16; G05D16/163; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2562; Y10T137/2564; Y10T137/2567; Y10T137/265; Y10T137/2655
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
219 words
AN AUTOMATIC CHANGE-OVER SYSTEM TO CONTROL THE FLOW OF FLUID WITHIN PREESTABLISHED PRESSURE LIMITS COMPRISING AN INPUT LINE; AN OUTPUT LINE; FIRST MAIN VALVE MEANS CONNECTED BETWEEN SAID LINES; SAID FIRST VALVE MEANS HAVING A FIRST CONTROL DIAPHRAGM; PILOT VALVE MEANS FOR SAID FIRST MAIN VALVE MEANS CONNECTED TO SAID INPUT LINE AND THE OUTPUT END OF SAID FIST VALVE MEANS AND HAVING A BIASED CONTROL DIAPHRAGM; CONNECTING MEANS CONNECTED TO THE OUTPUT END OF SAID PILOT VALVE MEANS TO ALLOW FLUID FLOW TO SAID FIRST CONTROL DIAPHRAGM, MEANS CONNECTING THE OUTPUT LINE TO SAID BIASED CONTROL DIAPHRAGM TO OPEN SAID PILOT VALVE WHEN THE PRESSURE IN THE OUTPUT LINE DECREASES AND TO CLOSE SAID PILOT VALVE WHEN THE PRESSURE IN THE OUTPUT LINE INCREASES, WHEREBY WHEN THE LAOD ON THE OUTPUT LINE INCREASES, THE RESULTING OUTPUT PRESSURE DROP CAUSES THE PILOT VALVE TO OPEN CAUSING GREATER FLUID FLOW OF THE FIRST CONTROL DIAPHRAGM TO OPEN SAID FIRST VALVE MEANS TO INCREASE THE FLUID FLOW AND PRESSURE TO THE OUTPUT LINE, SAID FIRST VALVE MEANS BEING OPERABLE ONLY FOR A FIRST RANGE OF PRESSURE, SECOND VALVE MEANS OPERABLE OVER A SECOND RANGE OF PRESSURE WHICH RANGE BEGINS APPROXIMATELY AT THE UPPER END OF SAID FIRST RANGE, CONNECTED BETWEEN SAID INPUT AND OUTPUT LINES IN PARALLE WITH AID FIRST MAIN
Claim 2
Dependent Claim
219 words
AN AUTOMATIC CHANGE-OVER SYSTEM TO CONTROL THE FLOW OF FLUID WITHIN PREESTABLISHED PRESSURE LIMITS COMPRISING AN INPUT LINE; AN OUTPUT LINE; FIRST MAIN VALVE MEANS CONNECTED BETWEEN SAID LINES; SAID FIRST VALVE MEANS HAVING A FIRST CONTROL DIAPHRAGM; PILOT VALVE MEANS FOR SAID FIRST MAIN VALVE MEANS CONNECTED TO SAID INPUT LINE AND THE OUTPUT END OF SAID FIST VALVE MEANS AND HAVING A BIASED CONTROL DIAPHRAGM; CONNECTING MEANS CONNECTED TO THE OUTPUT END OF SAID PILOT VALVE MEANS TO ALLOW FLUID FLOW TO SAID FIRST CONTROL DIAPHRAGM, MEANS CONNECTING THE OUTPUT LINE TO SAID BIASED CONTROL DIAPHRAGM TO OPEN SAID PILOT VALVE WHEN THE PRESSURE IN THE OUTPUT LINE DECREASES AND TO CLOSE SAID PILOT VALVE WHEN THE PRESSURE IN THE OUTPUT LINE INCREASES, WHEREBY WHEN THE LAOD ON THE OUTPUT LINE INCREASES, THE RESULTING OUTPUT PRESSURE DROP CAUSES THE PILOT VALVE TO OPEN CAUSING GREATER FLUID FLOW OF THE FIRST CONTROL DIAPHRAGM TO OPEN SAID FIRST VALVE MEANS TO INCREASE THE FLUID FLOW AND PRESSURE TO THE OUTPUT LINE, SAID FIRST VALVE MEANS BEING OPERABLE ONLY FOR A FIRST RANGE OF PRESSURE, SECOND VALVE MEANS OPERABLE OVER A SECOND RANGE OF PRESSURE WHICH RANGE BEGINS APPROXIMATELY AT THE UPPER END OF SAID FIRST RANGE, CONNECTED BETWEEN SAID INPUT AND OUTPUT LINES IN PARALLE WITH AID FIRST MAIN
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |