US3353549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid flow control systems
Assignee: Whessoe Ltd
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Filing: 1964-07-28
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Granted: 1967-11-21
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Expires: 1984-07-28
Abstract
No abstract record available.
Inventors
- 👤 Eric H Walker
- 👤 Ian W F Paterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:06
CPC Classifications
B; B63; B63B; B63B27/00; B63B27/24; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2534; Y10T137/2559; Y10T137/265; Y10T137/2668; Y10T137/2673
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
LIQUID FLOW CONTROL SYSTEM FOR FILLING AND EMPTYING A PLURALITY OF CONTAINERS, SAID SYSTEM COMPRISING A PLURALITY OF NORMALLY CLOSED INLET/OUTLET VALVES, ONE ASSOCIATED WITH EACH SAID CONTAINER FOR ADMITTING AND EXTRACTING LIQUID TO AND FROM THE ASSOCIATED CONTAINER, A PLURALITY OF MAIN SWITCHES EACH ASSOCIATED WITH AT LEAST ONE OF SAID VALVES, SAID MAIN SWITCHES EACH BEING OPERABLE TO CAUSE SAID VALVES TO OPEN, A PLURALITY OF UPPER LIMIT SWITCHES AND LOWER LIMIT SWITCHES, ONE UPPER LIMIT SWITCH AND ONE LOWER LIMIT SWITCH BEING ASSOCIATED WITH EACH CONTAINER AND RESPONSIVE TO PREDETERMINED UPPER AND LOWER LIQUID LEVELS IN SAID ASSOCIATED CONTAINER TO CAUSE THE VALVE ASSOCIATED WITH THAT CONTAINER TO RECLOSE, AND MEANS RESPONSIVE TO ACTUATION OF SAID LIMIT SWITCHES OF ONE CONTAINER TO INITIATE OPERATION OF THE MAIN SWITCH OF A SUBSEQUENT CONTAINER AND CHANGEOVER SWITCH MEANS CONNECTED TO ALTERNATELY RENDER SAID UPPER LIMIT SWITCHES OPERATIVE WITH SAID LOWER LIMIT SWITCHES INOPERATIVE, AND VICE VERSA.
Claim 2
Dependent Claim
157 words
LIQUID FLOW CONTROL SYSTEM FOR FILLING AND EMPTYING A PLURALITY OF CONTAINERS, SAID SYSTEM COMPRISING A PLURALITY OF NORMALLY CLOSED INLET/OUTLET VALVES, ONE ASSOCIATED WITH EACH SAID CONTAINER FOR ADMITTING AND EXTRACTING LIQUID TO AND FROM THE ASSOCIATED CONTAINER, A PLURALITY OF MAIN SWITCHES EACH ASSOCIATED WITH AT LEAST ONE OF SAID VALVES, SAID MAIN SWITCHES EACH BEING OPERABLE TO CAUSE SAID VALVES TO OPEN, A PLURALITY OF UPPER LIMIT SWITCHES AND LOWER LIMIT SWITCHES, ONE UPPER LIMIT SWITCH AND ONE LOWER LIMIT SWITCH BEING ASSOCIATED WITH EACH CONTAINER AND RESPONSIVE TO PREDETERMINED UPPER AND LOWER LIQUID LEVELS IN SAID ASSOCIATED CONTAINER TO CAUSE THE VALVE ASSOCIATED WITH THAT CONTAINER TO RECLOSE, AND MEANS RESPONSIVE TO ACTUATION OF SAID LIMIT SWITCHES OF ONE CONTAINER TO INITIATE OPERATION OF THE MAIN SWITCH OF A SUBSEQUENT CONTAINER AND CHANGEOVER SWITCH MEANS CONNECTED TO ALTERNATELY RENDER SAID UPPER LIMIT SWITCHES OPERATIVE WITH SAID LOWER LIMIT SWITCHES INOPERATIVE, AND VICE VERSA.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |