US4732044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure measuring device
Assignee: Marelli Europe SpA
•
Filing: 1986-09-17
•
Granted: 1988-03-22
•
Expires: 2006-09-17
Abstract
Abstract A pressure measuring device comprises a support casing having an aperture, a substrate mounted in the casing and deformable through the effect of a pressure to be measured introduced into the casing through the aperture, at least one electrical deformation sensor, preferably a thick-film resistor, applied to the substrate, circuit means housed in the casing and connected to the at least one electrical deformation sensor for outputting electrical signals indicative, according to a predetermined response curve, of the deformations of the substrate and hence of the pressure acting thereon, and manually-operable electrical adjustment means mounted in the casing and connected to the circuit means, for modifying predetermined characteristics of the response curve.
Inventors
- 👤 Roberto Dell'Acqua
- 👤 Giuseppe Dell'Orto
- 👤 Giuseppina Rossi
- 👤 Gilberto Dendi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:06
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/14; G01L19/148; G01L19/0007; G01L19/0038; G01L19/02; G01L19/142; G01L9/00; G01L9/0041; G01L9/0051; G01L9/0052; G01L9/0055; G01L9/02; G01L9/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
A pressure measuring device comprising a support casing having an aperture, a substrate mounted in the casing and deformable through the effect of a pressure to be measured introduced into the casing through the aperture, at least one electrical deformation sensor, comprised of a thick-film resistor, applied to the substrate, circuit means housed in the casing and connected to the at least one electrical deformation sensor for outputting electrical signals indicative, according to a predetermined response curve, of the deformations of the substrate and hence of the pressure acting thereon, and manually-operable electrical adjustment means mounted in the casing and connected to the circuit means, for modifying predetermined characteristics of the response curve; said adjustment means including first means for causing a constant-magnitude increase or decrease in the intensity of the signal output by the circuit means and second means for multiplying the intensity of the signal output by the circuit means by a constant factor wherein said casing is provided with the access means to enable adjustment of said first and second means from the exterior of said casing.
Claim 2
Dependent Claim
180 words
A pressure measuring device comprising a support casing having an aperture, a substrate mounted in the casing and deformable through the effect of a pressure to be measured introduced into the casing through the aperture, at least one electrical deformation sensor, comprised of a thick-film resistor, applied to the substrate, circuit means housed in the casing and connected to the at least one electrical deformation sensor for outputting electrical signals indicative, according to a predetermined response curve, of the deformations of the substrate and hence of the pressure acting thereon, and manually-operable electrical adjustment means mounted in the casing and connected to the circuit means, for modifying predetermined characteristics of the response curve; said adjustment means including first means for causing a constant-magnitude increase or decrease in the intensity of the signal output by the circuit means and second means for multiplying the intensity of the signal output by the circuit means by a constant factor wherein said casing is provided with the access means to enable adjustment of said first and second means from the exterior of said casing.
Claim 3
Dependent Claim
28 words
The device according to claim 1 in which the circuit means include an amplifier, and the adjustment means comprise a potentiometer for modifying the gain of the amplifier.
Claim 4
Dependent Claim
31 words
The device according to claim 1, in which a plurality of thick-film resistors are inserted in a bridge circuit, and the second means comprises a potentiometer connected to the bridge circuit.
Claim 5
Dependent Claim
36 words
The device according to claim 1, in which the circuit means comprise a differential amplifier, and the adjustment means comprise an first generator circuit for applying an offset voltage to an input of the differential amplifier.
Claim 6
Dependent Claim
23 words
The device according to claim 1, wherein the first and second means are mounted in respective housings provided with respective removable closure members.
Claim 7
Dependent Claim
22 words
The device according to claim 5, wherein the closure member for each housing is breakable to allow access to the adjustment means.
Claim 8
Dependent Claim
24 words
The device according to claim 6, wherein each housing can receive and retain a removable stopper after the breakage of the breakable closure member.
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) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |