Patent US4407474A successfully refreshed from Google Patents.
US3672223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure transducer
Assignee: Kistler Instrumente AG
•
Filing: 1970-06-19
•
Granted: 1972-06-27
•
Expires: 1990-06-19
Abstract
Abstract A pressure transducer employs a transducer element which is supported on the transducer casing and on a plate which serves as a pressure transmission medium and which is subjected to axial pre-stressing by the provision of an elastic tube spring, which is connected with the transducer casing and the pressure transmitting plate. The tube spring is arranged on a tubular diaphragm which seals the transducer element against the measuring pressure. A support member is also provided against which the tubular diaphragm rests in a radial direction, the support member being arranged between the diaphragm and the transducer element.
Inventors
- 👤 Gelli A Spescha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:59
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/008
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
A pressure transducer comprising a casing, a plate serving for pressure transmission, a transducer element supported by said casing and said plate, an elastic tubular diaphragm connected to said casing and said plate and sealing said transducer element against the measured pressure, said elastic tubular diaphragm subjecting said transducer element to axial prestressing, and a support member positioned between said elastic tubular diaphragm and said transducer element.
Claim 2
Dependent Claim
67 words
A pressure transducer comprising a casing, a plate serving for pressure transmission, a transducer element supported by said casing and said plate, an elastic tubular diaphragm connected to said casing and said plate and sealing said transducer element against the measured pressure, said elastic tubular diaphragm subjecting said transducer element to axial prestressing, and a support member positioned between said elastic tubular diaphragm and said transducer element.
Claim 3
Dependent Claim
28 words
A pressure transducer according to claim 1, characterized in that said support member is a ring body which surrounds said transducer element in the manner of a ring.
Claim 4
Dependent Claim
35 words
A pressure transducer according to claim 2, characterized in that said ring body is clamped between said pressure transmitting plate and said transducer casing and is under axial pre-stressing pressure produced by said tubular diaphragm.
Claim 5
Dependent Claim
25 words
A pressure transducer according to claim 1, characterized in that said support member is constructed to prevent radial stresses from acting on said transducer element.
Claim 6
Dependent Claim
27 words
A pressure transducer according to claim 1, characterized in that said elastic tubular diaphragm, said pressure transmitting plate and its mounting flange are formed in one piece.
Claim 7
Dependent Claim
28 words
A pressure transducer according to claim 1, characterized in that the ring body included projecting elements distributed around its outer peripheral surface, on which said tubular diaphragm bears.
Claim 8
Dependent Claim
25 words
A pressure transducer according to claim 6, characterized in that the projections are formed as ribs extending in the peripheral direction of the ring body.
Claim 9
Dependent Claim
32 words
A pressure transducer according to claim 1, characterized in that the pressure transmitting plate consists of a rigid material having a lower heat conductivity and a lower specific weight than the casing.
Claim 10
Dependent Claim
30 words
A pressure transducer according to claim 1, characterized in that the transducer element consists of a piezoelectric element and that the support member is formed of a piezoelectric crystal material.
Claim 11
Dependent Claim
30 words
A pressure transducer according to claim 2, characterized in that the ring body consists of individual discs placed one on the other and between which spacing means can be inserted.
Claim 12
Dependent Claim
29 words
A pressure transducer according to claim 1, characterized in that the effective axial length of the tubular diaphragm is the same as the axial length of the ring body.
Claim 13
Dependent Claim
22 words
A pressure transducer according to claim 1, characterized in that the support member and the tube diaphragm are formed in one piece.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |