Patent US4891628A successfully refreshed from Google Patents.
US4891628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Environmental matter detection system
Assignee: Individual
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Filing: 1988-12-29
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Granted: 1990-01-02
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Expires: 2008-12-29
Abstract
Abstract A matter sensing apparatus includes a piezoelectric transducer, having a face susceptible to matter accretions at a surface for which matter accretion detection is desired. The electrical circuit of the transducer is coupled in the feedback path of an amplifier to establish an oscillator that oscillates at frequencies determined by the resonant frequency of the transducer and the loading on its face. The oscillator signals are converted to binary signals and utilized with binary signals, provided by a thermostat, that a representative of temperatures above or below a selected temperature to provide signals indicative of whether ice or other matter has accredited on the surface.
Inventors
- 👤 Leonard Zuckerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:45
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/001; G08; G08B; G08B19/00; G08B19/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
97 words
An apparatus for sensing matter accretions on a surface comprising: an electro-mechanical transducer having a face directly exposed to matter accretions at said surface and a vibration frequency responsive to matter accretions on said face; oscillator means coupled to said transducer for oscillating at a frequency controlled by said vibration frequency; means coupled to said oscillator means for providing first signals representative of said oscillating frequencies; thermostat means for providing second signals representative of temperatures of said surface; and means responsive to said first and second signals for providing signals representative of matter conditions on said face.
Claim 2
Independent Claim
97 words
An apparatus for sensing matter accretions on a surface comprising: an electro-mechanical transducer having a face directly exposed to matter accretions at said surface and a vibration frequency responsive to matter accretions on said face; oscillator means coupled to said transducer for oscillating at a frequency controlled by said vibration frequency; means coupled to said oscillator means for providing first signals representative of said oscillating frequencies; thermostat means for providing second signals representative of temperatures of said surface; and means responsive to said first and second signals for providing signals representative of matter conditions on said face.
Claim 3
Dependent Claim
58 words
The apparatus of claim 1 wherein said first signals means includes: means responsive to signals generated by said oscillator means for providing rectangular waves at said frequencies; converting means coupled to said rectangular waves means for providing signals representative of said frequencies; and means responsive to said signals provided by said converting means for providing said first signals.
Claim 4
Dependent Claim
86 words
The apparatus of claim 2 wherein: said first signals means includes comparator means wherefrom said first signals are provided at a first level when said signals from said converting means exceed a predetermined threshold and at a second level when said signals from said converting means do not exceed said predetermined threshold; and said thermostat means provides said second signals at a first level when said temperatures exceed a preselected temperature threshold and at a second level when said temperatures do not exceed said preselected threshold.
Claim 5
Dependent Claim
16 words
The apparatus of claim 1 further including means for cyclically activating and deactivating said oscillator means.
Claim 6
Dependent Claim
26 words
The apparatus of claim 4 wherein said oscillator means is deactivated for intervals that are much longer than intervals during which said oscillating means are activated.
Claim 7
Dependent Claim
13 words
The apparatus of claim 1 wherein said electro-mechanical transducer is a piezoelectric transducer.
Claim 8
Independent Claim
192 words
An apparatus for sensing matter accretions on a surface comprising: an electro-mechanical transducer having a face directly exposed to matter accretions at said surface and a vibration frequency responsive to matter accretions on said face such that said vibration frequency decreases with loads on said face created by said matter accretions; oscillator means coupled to said transducer for providing oscillations at a frequency controlled by said vibration frequency; said transducer and oscillator means constructed and arranged such that said oscillations terminate when a predetermined load level is accumulated on said face; means coupled to said oscillator means for detecting said oscillations and providing a first signal having a first level when said oscillations are detected and a second level when oscillations are not detected; means for providing a second signal having a first level when temperatures at said surface exceed a preselected temperature and a second level when temperatures at said surface do not exceed said preselected temperature; and means responsive to said first and second signals for providing signals representative of matter accretions on said surface or no matter accretions on said surface and type of said accretions on said surface.
Claim 9
Independent Claim
192 words
An apparatus for sensing matter accretions on a surface comprising: an electro-mechanical transducer having a face directly exposed to matter accretions at said surface and a vibration frequency responsive to matter accretions on said face such that said vibration frequency decreases with loads on said face created by said matter accretions; oscillator means coupled to said transducer for providing oscillations at a frequency controlled by said vibration frequency; said transducer and oscillator means constructed and arranged such that said oscillations terminate when a predetermined load level is accumulated on said face; means coupled to said oscillator means for detecting said oscillations and providing a first signal having a first level when said oscillations are detected and a second level when oscillations are not detected; means for providing a second signal having a first level when temperatures at said surface exceed a preselected temperature and a second level when temperatures at said surface do not exceed said preselected temperature; and means responsive to said first and second signals for providing signals representative of matter accretions on said surface or no matter accretions on said surface and type of said accretions on said surface.
Claim 10
Dependent Claim
16 words
The apparatus of claim 7 further including means for cyclically activating and deactivating said oscillator means.
Claim 11
Dependent Claim
26 words
The apparatus of claim 8 wherein said oscillating means is deactivated for intervals that are much longer than intervals during which said oscillator means are activated.
Claim 12
Dependent Claim
14 words
The apparatus of claim 7 wherein said forced vibration element is a piezoelectric transducer.
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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) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |