US4377809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level system
Assignee: TDK Micronas GmbH
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Filing: 1981-04-27
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Granted: 1983-03-22
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Expires: 2001-04-27
Abstract
Abstract A liquid level system employs a bellows which is in flow communication with a differential pressure unit by a column of reference liquid. A float in the bellows carries a switch which energizes an alarm when liquid in the column is lost.
Inventors
- 👤 Victor N. Lawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:39
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A fluid link for a liquid level system comprising: a housing; movable pressure sensitive barrier means dividing said housing into separate first and second chambers; said housing having an inlet for admitting fluid under pressure into said first chamber; differential pressure sensing means; a conduit providing flow communication between said second chamber and said differential pressure sensing means; an incompressible liquid filling said second chamber and said conduit; a float in said second chamber, said float carrying switch actuating means; switch means adapted to be connected to indicating means, said switch means being actuated in response to the position of said switch actuating means on said float; and sealing means on said float for closing off said conduit when said liquid is lost therefrom.
Claim 2
Dependent Claim
124 words
A fluid link for a liquid level system comprising: a housing; movable pressure sensitive barrier means dividing said housing into separate first and second chambers; said housing having an inlet for admitting fluid under pressure into said first chamber; differential pressure sensing means; a conduit providing flow communication between said second chamber and said differential pressure sensing means; an incompressible liquid filling said second chamber and said conduit; a float in said second chamber, said float carrying switch actuating means; switch means adapted to be connected to indicating means, said switch means being actuated in response to the position of said switch actuating means on said float; and sealing means on said float for closing off said conduit when said liquid is lost therefrom.
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) | 1986-03-21 | 1986-09-20 | 1987-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-21 | 1990-09-20 | 1991-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-21 | 1994-09-20 | 1995-03-22 | $7700.00 | Window Closed / Lapsed |