US3881354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid velocity responsive instrument
Assignee: Individual
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Filing: 1973-04-17
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Granted: 1975-05-06
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Expires: 1993-04-17
Abstract
Abstract A velocity responsive instrument which is responsive to velocity of flow of a fluid medium, but not pressure. A movable member is mounted to be movable whereby it is moved by fluid medium in the direction of flow. The member is preferably biased by a spring. It responds only to velocity of flow and may be embodied as a flow switch, flow meter, transducer, or otherwise.
Inventors
- 👤 Sheldon L Block
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:34
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/02; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
125 words
A fluid flow responsive device comprising: a fluid flow conduit; an elongated fixed guide extending substantially coaxially of said conduit; a flow responsive element slidable along said guide and being spaced inwardly from the sides of said conduit sufficiently to substantially eliminate any pressure drop in fluid flowing in said conduit past said element whereby said element moves along said guide only in response to fluid flow in said conduit; a permanent magnet carried by said element for movement therewith; means yieldably urging said element and magnet to slide along said guide to an upstream position; and a magnetically operable reed switch within said guide and responsive to said magnet when proximate thereto to actuate said switch to one of an open and closed condition.
Claim 2
Dependent Claim
125 words
A fluid flow responsive device comprising: a fluid flow conduit; an elongated fixed guide extending substantially coaxially of said conduit; a flow responsive element slidable along said guide and being spaced inwardly from the sides of said conduit sufficiently to substantially eliminate any pressure drop in fluid flowing in said conduit past said element whereby said element moves along said guide only in response to fluid flow in said conduit; a permanent magnet carried by said element for movement therewith; means yieldably urging said element and magnet to slide along said guide to an upstream position; and a magnetically operable reed switch within said guide and responsive to said magnet when proximate thereto to actuate said switch to one of an open and closed condition.
Claim 3
Dependent Claim
28 words
A device as defined in claim 1 wherein said guide includes a threaded portion removably mounting the guide in a threaded opening in a wall of said conduit.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |