US2739939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swimming pool water level control system
Assignee: Individual
•
Filing: 1952-05-06
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Granted: 1956-03-27
•
Expires: 1972-05-06
Abstract
No abstract record available.
Inventors
- 👤 Donald J Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:36
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/02; E; E04; E04H; E04H4/00; E04H4/12; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7313; Y10T137/7323; Y10T137/7326; Y10T137/7358; Y10T137/742
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A CIRCULATORY SYSTEM FOR A BODY OF LIQUID IN A CONTAINER: A SUMP FOR RECEIVING LIQUID FROM THE CONTAINER; A PUMP HAVING AN INLET CONNECTED TO THE SUMP AND AN OUTLET ADAPTED TO DISCHARGE INTO THE CONTAINER; A FLOAT COOPERATING WITH THE LIQUID IN THE SUMP; A VALVE OPERATED BY THE FLOAT FOR CONTROLLING AN EXTERNAL SOURCE OF LIQUID SAID VALVE BEING OPERABLE UPON A LOWERING OF THE FLOAT FROM A PRE-DETERMINED LEVEL TO INTRODUCE ADDITIONAL LIQUID INTO THE SUMP; AND A PORTED PLUG COOPERATING WITH SAID INLET AND CARRIED BY SAID FLOAT FOR RESTRICTING THE FLOW OF LIQUID INTO SAID INLET UPON A LOWERING OF THE LEVEL OF LIQUID IN THE SUMP IN A PRE-DETERMINED AMOUNT.
Claim 2
Dependent Claim
118 words
IN A CIRCULATORY SYSTEM FOR A BODY OF LIQUID IN A CONTAINER: A SUMP FOR RECEIVING LIQUID FROM THE CONTAINER; A PUMP HAVING AN INLET CONNECTED TO THE SUMP AND AN OUTLET ADAPTED TO DISCHARGE INTO THE CONTAINER; A FLOAT COOPERATING WITH THE LIQUID IN THE SUMP; A VALVE OPERATED BY THE FLOAT FOR CONTROLLING AN EXTERNAL SOURCE OF LIQUID SAID VALVE BEING OPERABLE UPON A LOWERING OF THE FLOAT FROM A PRE-DETERMINED LEVEL TO INTRODUCE ADDITIONAL LIQUID INTO THE SUMP; AND A PORTED PLUG COOPERATING WITH SAID INLET AND CARRIED BY SAID FLOAT FOR RESTRICTING THE FLOW OF LIQUID INTO SAID INLET UPON A LOWERING OF THE LEVEL OF LIQUID IN THE SUMP IN A PRE-DETERMINED AMOUNT.
References Cited (Backward Citations)
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |