Patent US3237639A successfully refreshed from Google Patents.
US3237639A
Expired / Lapsed
US
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Control valve with precheck system
Assignee: Schulz Tool and Manufacturing Co
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Filing: 1959-08-28
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Granted: 1966-03-01
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Expires: 1979-08-28
Abstract
No abstract record available.
Inventors
- 👤 James K Mosher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:52
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/42; B; B64; B64D; B64D37/00; B64D37/005; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7297; Y10T137/73; Y10T137/7358; Y10T137/7368
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A VALVE ASSEMBLY FOR CONTROLLING THE FLOW OF LIQUID FROM A PRESSURIZED SUPPLY INTO A TANK, COMPRISING: AT LEAST ONE PILOT VALVE OPERATIVE TO CLOSE IN RESPONSE TO RISE OF THE LIQUID CONTENT OF THE TANK TO A PREDETERMINED LEVEL AT AN UPPER ZONE IN THE TANK; A NORMALLY CLOSED MAIN VALVE FOR LIQUID FLOW THERETHROUGH INTO THE TANK TO FORM A MAIN LIQUID BODY IN THE TANK, SAID MAIN VALVE BEING RESPONSIVE TO THE PRESSURE OF THE SUPPLY LIQUID TO OPEN WHEN SAID PILOT VALVE IS OPEN AND BEING RESPONSIVE TO CLOSING OF SAID PILOT VALVE TO CLOSE IN OPPOSITION TO THE LIQUID PRESSURE WHEN SAID PREDETERMINED LIQUID LEVEL IS REACHED; MEANS TO DIVERT A PORTION OF THE INFLOWING LIQUID
Claim 2
Dependent Claim
121 words
A VALVE ASSEMBLY FOR CONTROLLING THE FLOW OF LIQUID FROM A PRESSURIZED SUPPLY INTO A TANK, COMPRISING: AT LEAST ONE PILOT VALVE OPERATIVE TO CLOSE IN RESPONSE TO RISE OF THE LIQUID CONTENT OF THE TANK TO A PREDETERMINED LEVEL AT AN UPPER ZONE IN THE TANK; A NORMALLY CLOSED MAIN VALVE FOR LIQUID FLOW THERETHROUGH INTO THE TANK TO FORM A MAIN LIQUID BODY IN THE TANK, SAID MAIN VALVE BEING RESPONSIVE TO THE PRESSURE OF THE SUPPLY LIQUID TO OPEN WHEN SAID PILOT VALVE IS OPEN AND BEING RESPONSIVE TO CLOSING OF SAID PILOT VALVE TO CLOSE IN OPPOSITION TO THE LIQUID PRESSURE WHEN SAID PREDETERMINED LIQUID LEVEL IS REACHED; MEANS TO DIVERT A PORTION OF THE INFLOWING LIQUID
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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |