Patent US3789865A successfully refreshed from Google Patents.
US3789865A
Expired / Lapsed
US
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Liquid level control
Assignee: Motors Liquidation Co
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Filing: 1972-09-08
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Granted: 1974-02-05
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Expires: 1992-09-08
Abstract
Abstract A liquid level control for maintaining a predetermined liquid level in a primary reservoir and permitting storage of excess fluid in a secondary reservoir. The fluid in the primary reservoir is delivered by a pump to a fluid operated system. Excess fluid which cannot be immediately utilized by the fluid system is returned via a valve to the primary reservoir. The primary reservoir has a level indicating device which operates the valve to control fluid return to the primary reservoir from the fluid system. When the fluid level in the primary system is above a predetermined level the valve is operated to discontinue flow to the primary reservoir and direct the fluid to be stored temporarily in the secondary reservoir.
Inventors
- 👤 A Borman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:34
CPC Classifications
F; F16; F16K; F16K21/00; F16K21/04; F16K21/18; G; G05; G05D; G05D9/00; G05D9/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/265; Y10T137/2668; Y10T137/2673; Y10T137/2675; Y10T137/7287; Y10T137/7358; Y10T137/7368; Y10T137/7371; Y10T137/8593; Y10T137/85954
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
In a fluid system, a primary fluid reservoir; level indicating means in said reservoir for determining the fluid level in said reservoir; return passage means for returning fluid to said primary reservoir; first valve means operatively connected with said level indicating means and responsive thereto for blocking said return passage means when the fluid in said primary reservoir is above a predetermined level; a secondary fluid reservoir; secondary passage means for communicating fluid to and from said secondary reservoir; and second valve means in fluid communication with said return passage means and said secondary passage means being movable in response to fluid pressure in said return passage means when the fluid level in said primary reservoir is above said predetermined level to establish fluid communication between said return and secondary passage means and to establish fluid communication between said secondary passage means and said primary reservoir when the fluid level in said primary reservoir is below said predetermined level.
Claim 2
Dependent Claim
159 words
In a fluid system, a primary fluid reservoir; level indicating means in said reservoir for determining the fluid level in said reservoir; return passage means for returning fluid to said primary reservoir; first valve means operatively connected with said level indicating means and responsive thereto for blocking said return passage means when the fluid in said primary reservoir is above a predetermined level; a secondary fluid reservoir; secondary passage means for communicating fluid to and from said secondary reservoir; and second valve means in fluid communication with said return passage means and said secondary passage means being movable in response to fluid pressure in said return passage means when the fluid level in said primary reservoir is above said predetermined level to establish fluid communication between said return and secondary passage means and to establish fluid communication between said secondary passage means and said primary reservoir when the fluid level in said primary reservoir is below said predetermined level.
Claim 3
Dependent Claim
188 words
In a fluid system, a primary fluid reservoir; float means in said reservoir movable in response to the fluid level in said reservoir; return passage means for returning fluid to said primary reservoir; first valve means operatively connected with said float means for blocking said return passage means when the fluid in said primary reservoir is above a predetermined level; a secondary fluid reservoir; secondary passage means for communicating fluid to and from said secondary reservoir; second valve means in fluid communication with said return passage means and said secondary passage means being movable in response to fluid pressure in said return passage means when the fluid level in said primary reservoir is above said predetermined level to establish fluid communication between said return passage means and said secondary passage means and to establish fluid communication between said secondary passage means and said primary reservoir when the fluid level in said primary reservoir is below said predetermined level; and pump means for drawing fluid from said primary reservoir for delivery to a system and having valve means operable to deliver excess pump flow to said return passage means.
Claim 4
Dependent Claim
188 words
In a fluid system, a primary fluid reservoir; float means in said reservoir movable in response to the fluid level in said reservoir; return passage means for returning fluid to said primary reservoir; first valve means operatively connected with said float means for blocking said return passage means when the fluid in said primary reservoir is above a predetermined level; a secondary fluid reservoir; secondary passage means for communicating fluid to and from said secondary reservoir; second valve means in fluid communication with said return passage means and said secondary passage means being movable in response to fluid pressure in said return passage means when the fluid level in said primary reservoir is above said predetermined level to establish fluid communication between said return passage means and said secondary passage means and to establish fluid communication between said secondary passage means and said primary reservoir when the fluid level in said primary reservoir is below said predetermined level; and pump means for drawing fluid from said primary reservoir for delivery to a system and having valve means operable to deliver excess pump flow to said return passage means.
Claim 5
Dependent Claim
192 words
In a fluid system, a primary fluid reservoir; float means in said reservoir movable in response to the fluid level in said reservoir; return means for returning fluid to said primary reservoir including a fluid chamber having a first return passage means for delivering fluid thereto, and a second return passage means of larger diameter than said first return passage means for delivering fluid from said chamber; first valve means operatively connected with said float means for blocking said second return passage means when the fluid in said primary reservoir is above a predetermined level; a secondary fluid reservoir; secondary reservoir passage means for communicating fluid to and from said secondary reservoir; second valve means in fluid communication with said Fluid chamber and said secondary reservoir passage means being movable in response to fluid pressure in said fluid chamber when the fluid level in said primary reservoir is above said predetermined level to establish fluid communication between said chamber and secondary reservoir passage means and to establish fluid communication between said secondary reservior passage means and said primary reservoir when the fluid level in said primary reservoir is below said predetermined level.
Claim 6
Dependent Claim
192 words
In a fluid system, a primary fluid reservoir; float means in said reservoir movable in response to the fluid level in said reservoir; return means for returning fluid to said primary reservoir including a fluid chamber having a first return passage means for delivering fluid thereto, and a second return passage means of larger diameter than said first return passage means for delivering fluid from said chamber; first valve means operatively connected with said float means for blocking said second return passage means when the fluid in said primary reservoir is above a predetermined level; a secondary fluid reservoir; secondary reservoir passage means for communicating fluid to and from said secondary reservoir; second valve means in fluid communication with said Fluid chamber and said secondary reservoir passage means being movable in response to fluid pressure in said fluid chamber when the fluid level in said primary reservoir is above said predetermined level to establish fluid communication between said chamber and secondary reservoir passage means and to establish fluid communication between said secondary reservior passage means and said primary reservoir when the fluid level in said primary reservoir is below said predetermined level.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |