US3703099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure transducer
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-10-23
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Granted: 1972-11-21
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Expires: 1990-10-23
Abstract
Abstract A pressure transducer including a pressure sensitive device having at least one part sensitive to a difference in pressure on each side thereof, a detector for detecting flexural strain induced in the sensitive part, and a distensible envelope providing a closure for and located adjacent to and unsecured to said pressure sensitive device. Fluid, especially gas, pressure is supplied to the interior of the envelope via fluid access means to distend and isolate the pressure sensitive device and render it unresponsive to any external pressure thus enabling a ''''zero reading'''' to be determined by equalizing the pressure on each side of said pressure sensitive device.
Inventors
- 👤 William Rouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:03
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215; G; G01; G01L; G01L9/00; G01L9/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
A pressure transducer comprising: a pressure sensitive device including at least one part sensitive to a difference in pressure on each side of said part, and a detector for detecting strain induced in said sensitive part, an envelope providing a closure for said pressure sensitive device enabling a difference in pressure to exist on each side of said sensitive part included in said pressure sensitive device, and also including a distensible part located adjacent to, and unsecured to said pressure sensitive part, and fluid access means for permitting a supply of a fluid to the interior of said envelope and to each side of said sensitive part means for supplying fluid pressure to the interior of said pressure sensitive device at a pressure at least equal to that existing exteriorly of the distensible part, whereby the distensible part of the envelope is distended rendering the said pressure sensitive device unresponsive to the external pressure.
Claim 2
Dependent Claim
154 words
A pressure transducer comprising: a pressure sensitive device including at least one part sensitive to a difference in pressure on each side of said part, and a detector for detecting strain induced in said sensitive part, an envelope providing a closure for said pressure sensitive device enabling a difference in pressure to exist on each side of said sensitive part included in said pressure sensitive device, and also including a distensible part located adjacent to, and unsecured to said pressure sensitive part, and fluid access means for permitting a supply of a fluid to the interior of said envelope and to each side of said sensitive part means for supplying fluid pressure to the interior of said pressure sensitive device at a pressure at least equal to that existing exteriorly of the distensible part, whereby the distensible part of the envelope is distended rendering the said pressure sensitive device unresponsive to the external pressure.
Claim 3
Dependent Claim
154 words
A pressure transducer comprising: a pressure sensitive device including at least one part sensitive to a difference in pressure on each side of said part, and a detector for detecting strain induced in said sensitive part, an envelope providing a closure for said pressure sensitive device enabling a difference in pressure to exist on each side of said sensitive part included in said pressure sensitive device, and also including a distensible part located adjacent to, and unsecured to said pressure sensitive part, and fluid access means for permitting a supply of a fluid to the interior of said envelope and to each side of said sensitive part means for supplying fluid pressure to the interior of said pressure sensitive device at a pressure at least equal to that existing exteriorly of the distensible part, whereby the distensible part of the envelope is distended rendering the said pressure sensitive device unresponsive to the external pressure.
Claim 4
Dependent Claim
154 words
A pressure transducer comprising: a pressure sensitive device including at least one part sensitive to a difference in pressure on each side of said part, and a detector for detecting strain induced in said sensitive part, an envelope providing a closure for said pressure sensitive device enabling a difference in pressure to exist on each side of said sensitive part included in said pressure sensitive device, and also including a distensible part located adjacent to, and unsecured to said pressure sensitive part, and fluid access means for permitting a supply of a fluid to the interior of said envelope and to each side of said sensitive part means for supplying fluid pressure to the interior of said pressure sensitive device at a pressure at least equal to that existing exteriorly of the distensible part, whereby the distensible part of the envelope is distended rendering the said pressure sensitive device unresponsive to the external pressure.
Claim 5
Dependent Claim
46 words
The pressure transducer of claim 1 wherein the pressure sensitive device comprises a pair of prongs which flex about a fixed point in response to a difference in pressure on each side of the prongs, and the detector is a strain gauge incorporating a silicon crystal.
Claim 6
Dependent Claim
17 words
The pressure transducer of claim 1 wherein the envelope comprises a balloon surrounding the pressure sensitive device.
Claim 7
Dependent Claim
21 words
The pressure transducer of claim 1 wherein the envelope comprises, in part, a rigid structure and, in part, a distendable membrane.
Claim 8
Dependent Claim
83 words
A method of determining the ''''zero pressure'''' reading of a pressure transducer having the features of the pressure transducer of claim 1, which comprises the steps of passing a fluid through the fluid access means thereby distending the distensible part of the envelope and rendering the pressure sensitive device unresponsive to any external pressure and equalizing the pressure on each side of the movable part included in the pressure sensitive device, and then reading the recorded pressure which represents the ''''zero pressure'''' reading.
References Cited (Backward Citations)
US3553625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |