US4507973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Housing for capacitive pressure sensor
Assignee: Borg Warner Corp
•
Filing: 1983-08-31
•
Granted: 1985-04-02
•
Expires: 2003-08-31
Abstract
Abstract A housing for a capacitive pressure sensor generally utilized to measure fluid pressure. A metallic housing for a ceramic diaphragm provides greater flexural strength to compensate for the differences in the thermal expansion and bulk modulus of elasticity of such ceramic diaphragm and metal housing.
Inventors
- 👤 Rodney E. Barr
- 👤 George E. Kochanek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:38
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/0072; G01L9/0075
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
159 words
A housing for a capacitive sensor used in the measurement of pressure in a fluid, which capacitive sensor includes: a flexible ceramic diaphragm including a reference surface, a bottom surface, sidewalls, and a chamfered shoulder between said reference surface and sidewalls, and a pressure chamber open at the bottom surface, the reference surface being deflectable in response to a force acting in said pressure chamber; a capacitive sensor positioned so that its capacitance is varied as the diaphragm reference surface is deflected; wherein said housing comprises a lower member and an upper member connected to each other and enclosing the sensor; said housing lower member defining a recess for receiving the diaphragm sidewalls, and further defining a channel communicating with the diaphragm pressure chamber; and said housing upper member defines first and second portions of different diameters, and a shoulder between the first and second portions of different diameters, which shoulder abuts the chamfered shoulder of said flexible diaphragm.
Claim 2
Dependent Claim
159 words
A housing for a capacitive sensor used in the measurement of pressure in a fluid, which capacitive sensor includes: a flexible ceramic diaphragm including a reference surface, a bottom surface, sidewalls, and a chamfered shoulder between said reference surface and sidewalls, and a pressure chamber open at the bottom surface, the reference surface being deflectable in response to a force acting in said pressure chamber; a capacitive sensor positioned so that its capacitance is varied as the diaphragm reference surface is deflected; wherein said housing comprises a lower member and an upper member connected to each other and enclosing the sensor; said housing lower member defining a recess for receiving the diaphragm sidewalls, and further defining a channel communicating with the diaphragm pressure chamber; and said housing upper member defines first and second portions of different diameters, and a shoulder between the first and second portions of different diameters, which shoulder abuts the chamfered shoulder of said flexible diaphragm.
Claim 3
Dependent Claim
39 words
A housing for a capacitive sensor as claimed in claim 1 wherein said lower member recess includes a face defining a groove to receive a seal means to contact said diaphragm bottom surface and seal said diaphragm pressure chamber.
Claim 4
Dependent Claim
45 words
A housing for a capacitive sensor as claimed in claim 2 wherein a loading ring is mounted on said chamfered shoulder and a Belleville spring is provided between said housing shoulder and said loading ring to maintain said diaphragm bottom surface against said seal means.
Claim 5
Dependent Claim
34 words
A housing for a capacitive sensor as claimed in claim 1 wherein a loading ring is mounted on said chamfered shoulder and a Belleville spring is provided between said housing shoulder and loading ring.
Claim 6
Dependent Claim
45 words
A housing for a capacitive sensor as claimed in claim 1 wherein said shoulder of said upper member is at an angle that is supplementary to said chamfered shoulder to be matable with said chamfered shoulder to maintain said sensor in said lower member recess.
Claim 7
Dependent Claim
43 words
A housing for a capacitive sensor as claimed in claim 1 wherein said sensor is of a ceramic material and said housing is of a metal with a different coefficient of expansion and bulk modulus of elasticity than said ceramic sensor retained therein.
Claim 8
Dependent Claim
39 words
A housing for a capacitive sensor as claimed in claim 1 wherein said lower member defines a sidewall and seal groove therein to receive a seal means, which seal means contacts said upper member to seal said capacitive sensor.
References Cited (Backward Citations)
US3479879A
Cited
US3859575A
Cited
US3859575B1
Cited
US4089036A
Cited
US4125027A
Cited
US4295376A
Cited
US4434451A
Cited
US4382385A
Cited
US4382377A
Cited
US4458537A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |