US5554907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle speed measurement apparatus
Assignee: MITRON SYSTEMS Corp A CORP OF
•
Filing: 1992-06-26
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Granted: 1996-09-10
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Expires: 2012-06-26
Abstract
Abstract A vehicle speed monitoring system has a pair of parallel piezoelectric sensors or pressure transducers carried in closely spaced relation by a common elastomeric carrier such that the distance D between the sensors is maintained constant. A time measuring circuit connected to the sensors measures the time between peak voltages induced in the piezoelectric sensor transducers which is used to calculate and display vehicle speed. A weight is secured to or embedded in the carrier to cause the carrier to hug the roadway and be immune to lifting because of air currents and turbulence.
Inventors
- 👤 Donald A. Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:25
CPC Classifications
E; E01; E01F; E01F9/00; E01F9/50; E01F9/529; G; G08; G08G; G08G1/00; G08G1/01; G08G1/02; G08G1/052; H; H10; H10N; H10N30/00; H10N30/30; H10N30/302; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
107 words
In a vehicle speed sensor system for sensing wheeled vehicular traffic thereover, the improvement comprising, a flexible carrier member having an elongated flat elastomeric member, a pair of elongated piezoelectric pressure sensors embedded in closely spaced parallel relation in said flat, elastomeric member, said elastomeric member maintaining the distance between said piezoelectric pressure sensors constant, and means for measuring the time interval between peak voltages induced in said piezoelectric pressure sensors by wheeled vehicular traffic thereon, and wherein said sensors include a common strip of piezoelectric plastic and a pair of spaced electrodes are formed on said common strip to constitute said pair of piezoelectric pressure sensors.
Claim 2
Dependent Claim
107 words
In a vehicle speed sensor system for sensing wheeled vehicular traffic thereover, the improvement comprising, a flexible carrier member having an elongated flat elastomeric member, a pair of elongated piezoelectric pressure sensors embedded in closely spaced parallel relation in said flat, elastomeric member, said elastomeric member maintaining the distance between said piezoelectric pressure sensors constant, and means for measuring the time interval between peak voltages induced in said piezoelectric pressure sensors by wheeled vehicular traffic thereon, and wherein said sensors include a common strip of piezoelectric plastic and a pair of spaced electrodes are formed on said common strip to constitute said pair of piezoelectric pressure sensors.
Claim 3
Dependent Claim
22 words
The invention defined in claim 1 wherein the center-to-center spacing for said pair of spaced electrodes is less than one (1) inch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-10 | 2000-03-11 | 2000-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-10 | 2004-03-11 | 2004-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-10 | 2008-03-11 | 2008-09-10 | $7700.00 | Window Closed / Lapsed |