Patent US4476720A successfully refreshed from Google Patents.
US4476720A
Expired / Lapsed
US
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Unidirectional fluidflow sensor system
Assignee: Cambridge AccuSense Inc
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Filing: 1982-06-14
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Granted: 1984-10-16
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Expires: 2002-06-14
Abstract
Abstract A unidirectional fluidflow sensor system including: a sensing chamber for placement in a fluidflow to be monitored; the chamber including input port means facing toward the fluidflow and smaller, output port means spaced from the input port means and disposed transversely to the fluidflow; a sensing element in the chamber in the path between the first and second port means; and means, responsive to the element, for detecting a change in flow between the input and output port means.
Inventors
- 👤 Raouf A. Ismail
- 👤 Jonathan T. Mead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:18
CPC Classifications
G; G01; G01F; G01F5/00; G01F1/00; G01F1/68; G01F1/684; G01F1/6842; G01F1/696; G01P; G01P13/00; G01P13/02; G01P13/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
94 words
A unidirectional fluidflow sensor system comprising: a sensing chamber for placement in a fluidflow to be monitored; said chamber including input port means which includes a hole on the side of said chamber facing toward the fluidflow and output port means which includes two holes, one on each adjacent side of said chamber and disposed transversely to said fluidflow; a sensing element in said chamber in the path between said input and output port means; and means, responsive to said element, for detecting a change in flow between said input and output port means.
Claim 2
Dependent Claim
94 words
A unidirectional fluidflow sensor system comprising: a sensing chamber for placement in a fluidflow to be monitored; said chamber including input port means which includes a hole on the side of said chamber facing toward the fluidflow and output port means which includes two holes, one on each adjacent side of said chamber and disposed transversely to said fluidflow; a sensing element in said chamber in the path between said input and output port means; and means, responsive to said element, for detecting a change in flow between said input and output port means.
Claim 3
Dependent Claim
20 words
The unidirectional fluidflow sensor system of claim 1 in which said sensing element includes a resistance which varies with temperature.
Claim 4
Dependent Claim
21 words
The unidirectional fluidflow sensor system of claim 2 in which said sensing element is a thermistor with a negative resistance characteristic.
Claim 5
Dependent Claim
33 words
The unidirectional fluidflow sensor system of claim 2 in which said sensing element includes a resistance characteristic which has a generally linear region and said means for detecting operates in said linear region.
Claim 6
Dependent Claim
102 words
A unidirectional fluidflow sensor system comprising: a sensing chamber for placement in a fluidflow to be monitored; said chamber including input port means facing toward the fluidflow, output port means spaced from said input port means and disposed transversely to said fluidflow and a baffle separating said chamber into one section including said input port means and a second section including said output port means, said baffle including a hole interconnecting said sections; a sensing element disposed in said hole in said baffle; and means, responsive to said element, for detecting a change in flow between said input and output port means.
Claim 7
Dependent Claim
102 words
A unidirectional fluidflow sensor system comprising: a sensing chamber for placement in a fluidflow to be monitored; said chamber including input port means facing toward the fluidflow, output port means spaced from said input port means and disposed transversely to said fluidflow and a baffle separating said chamber into one section including said input port means and a second section including said output port means, said baffle including a hole interconnecting said sections; a sensing element disposed in said hole in said baffle; and means, responsive to said element, for detecting a change in flow between said input and output port means.
Claim 8
Dependent Claim
36 words
Theunidirectional fluidflow sensor system of claim 5 in which said input port means is a hole on the side of said chamber and said output port means is a hole on the end of said chamber.
Claim 9
Dependent Claim
20 words
The unidirectional fluidflow sensor system of claim 5 in which said sensing element includes a resistance which varies with temperature.
Claim 10
Dependent Claim
21 words
The unidirectional fluidflow sensor system of claim 7 in which said sensing element is a thermistor with a negative resistance characteristic.
Claim 11
Dependent Claim
33 words
The unidirectional fluidflow sensor system of claim 7 in which said sensing element includes a resistance characteristic which has a generally linear region and said means for detecting operates in said linear region.
Claim 12
Dependent Claim
33 words
The unidirectional fluidflow sensor system of claim 5 in which said means for detecting is mounted on a circuit board and said baffle is constituted by at least a portion of that board.
Claim 13
Dependent Claim
123 words
A unidirectional fluidflow sensor system comprising: a sensing chamber for placement in a fluidflow to be monitored; said chamber including input port means facing toward the fluidflow, output port means spaced from said input port means and disposed transversely to said fluidflow and a baffle separating said chamber into one section including said input port means and a second section including said output port means said baffle including a hole therein; a sensing element disposed in said hole in said baffle; and means, responsive to said element, for detecting a change in flow between said input and output port means, said means for detecting being mounted on a circuit board and said baffle being constituted by at least a portion of that board.
Claim 14
Dependent Claim
123 words
A unidirectional fluidflow sensor system comprising: a sensing chamber for placement in a fluidflow to be monitored; said chamber including input port means facing toward the fluidflow, output port means spaced from said input port means and disposed transversely to said fluidflow and a baffle separating said chamber into one section including said input port means and a second section including said output port means said baffle including a hole therein; a sensing element disposed in said hole in said baffle; and means, responsive to said element, for detecting a change in flow between said input and output port means, said means for detecting being mounted on a circuit board and said baffle being constituted by at least a portion of that board.
Claim 15
Dependent Claim
37 words
The unidirectional fluidflow sensor system of claim 11 in which said input port means is a hole on the side of said chamber and said output port means is a hole on the end of said chamber.
Claim 16
Dependent Claim
20 words
The unidirectional fluidflow sensor system of claim 11 in which said sensing element includes a resistance which varies with temperature.
Claim 17
Dependent Claim
21 words
The unidirectional fluidflow sensor system of claim 13 in which said sensing element is a thermistor with a negative resistance characteristic.
Claim 18
Dependent Claim
33 words
The unidirectional fluidflow sensor system of claim 13 in which said sensing element includes a resistance characteristic which has a generally linear region and said means for detecting operates in said linear region.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |