Patent US3344804A successfully refreshed from Google Patents.
US3344804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level control
Assignee: Whirlpool Corp
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Filing: 1964-07-08
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Granted: 1967-10-03
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Expires: 1984-07-08
Abstract
No abstract record available.
Inventors
- 👤 John B Lyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:54
CPC Classifications
A; A47; A47L; A47L15/00; A47L15/42; A47L15/4244; G; G05; G05D; G05D9/00; G05D9/12; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7339; Y10T137/7349; Y10T137/7498
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
203 words
APPARATUS COMPRISING: A CONTAINER FOR HOLDING A PRESELECTED VOLUME OF LIQUID AND HAVING A BOTTOM; MEANS DEFINING A SPACE HAVING A LOWER PORTION AT A LEVEL LOWER THAN SAID BOTTOM; MEANS DEFINING A LIQUID FLOW PASSAGE COMMUNICATING WITH SAID LOWER SPACE PORTION AND THE BOTTOM OF SAID CONTAINER; CONTROL MEANS RESPONSIVE TO AIR PRESSURE FOR PROVIDING A SIGNAL; DUCT MEANS COMMUNICATING WITH AN UPPER PORTION OF SAID SPACE AND SAID CONTROL MEANS FOR TRANSMITTING TO THE CONTROL MEANS THE HEAD PRESSURE OF THE LIQUID IN SAID PASSAGE AND SAID CONTAINER ABOVE SAID LOWER PORTION OF SAID SPACE; MEANS FOR DELIVERING LIQUID THROUGH THE LOWER PORTION OF SAID SPACE AND SAID FLOW PASSAGE INTO SAID CONTAINER; AND MEANS FOR PROVIDING A SUPPLY OF AIR TO SAID LIQUID PRIOR TO THE DELIVERY THEREOF THROUGH SAID SPACE, WHEREBY A PORTION OF THE AIR IN SAID LIQUID RISES UPWARDLY THEREFROM IN SAID SPACE TO SAID UPPER PORTION THEREOF TO CAUSE SAID DUCT MEANS AND SAID UPPER PORTION OF THE SPACE TO BE SUBSTANTIALLY FULLY AIR FILLED AS AN INCIDENT OF THE DELIVERY OF SAID PRESELECTED VOLUME OF LIQUID TO SAID CONTAINER AND PROVIDE TO SAID CONTROL MEANS AN AIR PRESSURE ACCURATELY CORRESPONDING TO SAID LIQUID HEAD PRESSURE.
Claim 2
Dependent Claim
203 words
APPARATUS COMPRISING: A CONTAINER FOR HOLDING A PRESELECTED VOLUME OF LIQUID AND HAVING A BOTTOM; MEANS DEFINING A SPACE HAVING A LOWER PORTION AT A LEVEL LOWER THAN SAID BOTTOM; MEANS DEFINING A LIQUID FLOW PASSAGE COMMUNICATING WITH SAID LOWER SPACE PORTION AND THE BOTTOM OF SAID CONTAINER; CONTROL MEANS RESPONSIVE TO AIR PRESSURE FOR PROVIDING A SIGNAL; DUCT MEANS COMMUNICATING WITH AN UPPER PORTION OF SAID SPACE AND SAID CONTROL MEANS FOR TRANSMITTING TO THE CONTROL MEANS THE HEAD PRESSURE OF THE LIQUID IN SAID PASSAGE AND SAID CONTAINER ABOVE SAID LOWER PORTION OF SAID SPACE; MEANS FOR DELIVERING LIQUID THROUGH THE LOWER PORTION OF SAID SPACE AND SAID FLOW PASSAGE INTO SAID CONTAINER; AND MEANS FOR PROVIDING A SUPPLY OF AIR TO SAID LIQUID PRIOR TO THE DELIVERY THEREOF THROUGH SAID SPACE, WHEREBY A PORTION OF THE AIR IN SAID LIQUID RISES UPWARDLY THEREFROM IN SAID SPACE TO SAID UPPER PORTION THEREOF TO CAUSE SAID DUCT MEANS AND SAID UPPER PORTION OF THE SPACE TO BE SUBSTANTIALLY FULLY AIR FILLED AS AN INCIDENT OF THE DELIVERY OF SAID PRESELECTED VOLUME OF LIQUID TO SAID CONTAINER AND PROVIDE TO SAID CONTROL MEANS AN AIR PRESSURE ACCURATELY CORRESPONDING TO SAID LIQUID HEAD PRESSURE.
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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |