US4261209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure sensing apparatus
Assignee: Bosch Corp
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Filing: 1979-02-23
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Granted: 1981-04-14
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Expires: 1999-02-23
Abstract
Abstract A sensor (16) is connected to a high pressure line (13) in a fuel injection system for an internal combustion engine. The sensor (16) produces an output current which is proportional to the pressure in the line (13). The current is converted into a corresponding voltage and a displayed a voltmeter (21). An alarm is produced when the voltage exceeds a predetermined value or range. A second voltmeter (23) is energized to display the voltage when the alarm is produced.
Inventors
- 👤 Hiroshi Hatsuno
- 👤 Masaki Saito
- 👤 Mitsuo Fukushima
- 👤 Shinji Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:23
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/08; G01L19/12; G01L9/00; G01L9/12; F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D2041/1413; F02D2041/1432
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
An apparatus for measuring pressure in a fluid passageway, comprising: a pressure sensor connected to the passageway for producing an electric current corresponding to fluid pressure; a current to voltage converter for converting an output current of the sensor to a voltage; a display for displaying said voltage; comparator means for comparing said voltage with a reference voltage and alarm means for producing an alarm in accordance with a predetermined relationship between said voltage and reference voltage; and a second display for displaying said voltage when the alarm means produces the alarm.
Claim 2
Independent Claim
92 words
An apparatus for measuring pressure in a fluid passageway, comprising: a pressure sensor connected to the passageway for producing an electric current corresponding to fluid pressure; a current to voltage converter for converting an output current of the sensor to a voltage; a display for displaying said voltage; comparator means for comparing said voltage with a reference voltage and alarm means for producing an alarm in accordance with a predetermined relationship between said voltage and reference voltage; and a second display for displaying said voltage when the alarm means produces the alarm.
Claim 3
Dependent Claim
13 words
An apparatus as in claim 1, in which the display comprises a voltmeter.
Claim 4
Dependent Claim
25 words
An apparatus as in claim 1, further comprising a filter connected between the converter and the display for removing ripple and noise from said voltage.
Claim 5
Dependent Claim
25 words
An apparatus as in claim 1, in which the alarm means is constructed to produce the alarm when said voltage is above the reference voltage.
Claim 6
Dependent Claim
25 words
An apparatus as in claim 1, in which the alarm means is constructed to produce the alarm when said voltage is below the reference voltage.
Claim 7
Independent Claim
87 words
An apparatus for measuring pressure in a fluid passageway, comprising: a pressure sensor connected to the passageway for producing an electric current corresponding to fluid pressure; a current to voltage converter for converting an output current of the sensor to a voltage; a display for displaying said voltage; comparator means and alarm means connected to the comparator means for producing an alarm when said voltage is outside of a predetermined voltage range; and a second display for displaying said voltage when the alarm means produces the alarm.
Claim 8
Independent Claim
87 words
An apparatus for measuring pressure in a fluid passageway, comprising: a pressure sensor connected to the passageway for producing an electric current corresponding to fluid pressure; a current to voltage converter for converting an output current of the sensor to a voltage; a display for displaying said voltage; comparator means and alarm means connected to the comparator means for producing an alarm when said voltage is outside of a predetermined voltage range; and a second display for displaying said voltage when the alarm means produces the alarm.
Claim 9
Independent Claim
85 words
An apparatus for measuring pressure in a fluid passageway, comprising: a pressure sensor connected to the passageway for producing an electric current corresponding to fluid pressure; a current to voltage converter for converting an output current of the sensor to a voltage; a display for displaying said voltage; comparator means and alarm means connected to the comparator means for producing an alarm when said voltage is inside a predetermined voltage; and a second display for displaying said voltage when the alarm means produces the alarm.
Claim 10
Independent Claim
85 words
An apparatus for measuring pressure in a fluid passageway, comprising: a pressure sensor connected to the passageway for producing an electric current corresponding to fluid pressure; a current to voltage converter for converting an output current of the sensor to a voltage; a display for displaying said voltage; comparator means and alarm means connected to the comparator means for producing an alarm when said voltage is inside a predetermined voltage; and a second display for displaying said voltage when the alarm means produces the alarm.
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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |