US5027522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic level indicator
Assignee: Amrad Research and Development LP
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Filing: 1989-12-15
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Granted: 1991-07-02
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Expires: 2009-12-15
Abstract
Abstract An electronic level indicator, having a housing including at least one planar surface, a gravity responsive sensor mounted on the housing, the sensor constituting at least a part of two branches of an electronic bridge circuit, a pulse generator coupled to the bridge circuit for feeding the bridge circuit with short pulses, a differential amplifier connected to the output of the bridge circuit, an A/D converter connected in circuit for receiving signals from the amplifier and a display unit connected to the output of the converter for displaying numerical data indicative of the inclination of the planar surface.
Inventors
- 👤 Uri Cagan
- 👤 Lev Diamant
- 👤 Geoffrey Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:00
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/18; G01C9/20; G01C9/02; G01C9/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
An electronic level indicator, comprising: a housing having at least one planar surface; gravity responsive sensor means mounted on said housing, said sensor means constituting at least a part of two branches of an electronic bridge circuit: a pulse generator coupled to said bridge circuit for feeding said bridge circuit with short pulses; a differential amplifier connected to the output of said bridge circuit; an A/D converter connected in circuit for receiving signals from said amplifier and for receiving synchronization signals from said pulse generator, and a display unit connected to the output of said converter for displaying numerical data indicative of the inclination of said planar surface.
Claim 2
Dependent Claim
108 words
An electronic level indicator, comprising: a housing having at least one planar surface; gravity responsive sensor means mounted on said housing, said sensor means constituting at least a part of two branches of an electronic bridge circuit: a pulse generator coupled to said bridge circuit for feeding said bridge circuit with short pulses; a differential amplifier connected to the output of said bridge circuit; an A/D converter connected in circuit for receiving signals from said amplifier and for receiving synchronization signals from said pulse generator, and a display unit connected to the output of said converter for displaying numerical data indicative of the inclination of said planar surface.
Claim 3
Dependent Claim
16 words
The level indicator as claimed in claim 1 wherein said sensor means is an electrolytic-type sensor.
Claim 4
Dependent Claim
17 words
The level indicator as claimed in claim 1 wherein said sensor means is a capacitive pendulum-type sensor.
Claim 5
Dependent Claim
148 words
An electronic level indicator, comprising: a housing having at least one planar surface; gravity responsive sensor means mounted on said housing, said sensor means constituting at least a part of two branches of an electronic bridge circuit; a microprocessor coupled to said bridge circuit for feeding said circuit with short pulses; a differential amplifier connected to the output of said bridge circuit: a sample and hold circuit connected to receive output signals from said differential amplifier and said microprocessor: a comparator connected to receive a first signal, at its first input terminal from said sample and hold circuit, a second signal at its second input terminal from said microprocessor via a D/A converter. and to provide an output signal to said microprocessor, and a display unit connected to said microprocessor for displaying numerical data indicative of the inclination of said planar surface with respect to a reference level.
Claim 6
Dependent Claim
148 words
An electronic level indicator, comprising: a housing having at least one planar surface; gravity responsive sensor means mounted on said housing, said sensor means constituting at least a part of two branches of an electronic bridge circuit; a microprocessor coupled to said bridge circuit for feeding said circuit with short pulses; a differential amplifier connected to the output of said bridge circuit: a sample and hold circuit connected to receive output signals from said differential amplifier and said microprocessor: a comparator connected to receive a first signal, at its first input terminal from said sample and hold circuit, a second signal at its second input terminal from said microprocessor via a D/A converter. and to provide an output signal to said microprocessor, and a display unit connected to said microprocessor for displaying numerical data indicative of the inclination of said planar surface with respect to a reference level.
Claim 7
Dependent Claim
22 words
The indicator as claimed in claim 4 further comprising a pulse conditioner connected in circuit between said microprocessor and said bridge circuit.
Claim 8
Dependent Claim
32 words
The indicator as claimed in claim 4 further comprising a visual or acoustic signalling means activated whenever the indicator is positioned within a preset range of accuracy of measurements to be performed.
Claim 9
Dependent Claim
31 words
The indicator as claimed in claim 4 further comprising circuit means for selectively indicating on said display unit a numerical value indicative of an inclination relative to any predetermined reference level.
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) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |