US3596263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Icing condition detecting apparatus
Assignee: Holley Performance Products Inc
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Filing: 1968-09-23
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Granted: 1971-07-27
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Expires: 1988-09-23
Abstract
Abstract An icing condition detecting apparatus, by means of transducers, compares the temperature of a monitored surface against the temperature of an established reference temperature and further compares dew point against the temperature of said monitored surface in order to determine if such psychrometric parameters indicate the existence of conditions conducive to frost or ice formation on said monitored surface.
Inventors
- 👤 Michael F Ciemochowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:07
CPC Classifications
G; G08; G08B; G08B19/00; G08B19/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
255 words
Apparatus for detecting icing conditions on a surface, said apparatus comprising first means for creating a first output signal indicating that said surface has attained a temperature equivalent to a predetermined temperature, second means for creating a second output signal indicating that said temperature of said surface is equivalent to dew point, and third means responsive to said first and second output signals for causing actuation of related output means, said first means comprising temperature responsive transducer means responsive to said temperature of said surface and effective for producing a variable signal in accordance therewith, reference signal producing means effective for creating a reference signal indicative of said predetermined temperature, and comparator means for receiving said variable signal and said reference signal, said comparator means being effective to create said first output signal when said variable signal and said reference signal collectively indicate that said temperature of said surface and said predetermined temperature are equal to each other, said second means comprising fourth means effective for both sensing ambient temperature and creating a first variable signal in accordance with the difference between said temperature of said surface and said ambient temperature, humidity responsive transducer means effective for sensing relative ambient humidity and creating a second variable signal in accordance with the difference between said ambient temperature and dew point, and first comparator means for receiving said first and second variable signals, said first comparator means being effective to create said second output signal when said first and second variable signals are equal to each other.
Claim 2
Dependent Claim
255 words
Apparatus for detecting icing conditions on a surface, said apparatus comprising first means for creating a first output signal indicating that said surface has attained a temperature equivalent to a predetermined temperature, second means for creating a second output signal indicating that said temperature of said surface is equivalent to dew point, and third means responsive to said first and second output signals for causing actuation of related output means, said first means comprising temperature responsive transducer means responsive to said temperature of said surface and effective for producing a variable signal in accordance therewith, reference signal producing means effective for creating a reference signal indicative of said predetermined temperature, and comparator means for receiving said variable signal and said reference signal, said comparator means being effective to create said first output signal when said variable signal and said reference signal collectively indicate that said temperature of said surface and said predetermined temperature are equal to each other, said second means comprising fourth means effective for both sensing ambient temperature and creating a first variable signal in accordance with the difference between said temperature of said surface and said ambient temperature, humidity responsive transducer means effective for sensing relative ambient humidity and creating a second variable signal in accordance with the difference between said ambient temperature and dew point, and first comparator means for receiving said first and second variable signals, said first comparator means being effective to create said second output signal when said first and second variable signals are equal to each other.
Claim 3
Dependent Claim
32 words
Apparatus according to claim 1 wherein said related output means comprises means for applying heat to said surface in order to raise said temperature of said surface above said predetermined temperature value.
Claim 4
Dependent Claim
24 words
Apparatus according to claim 1 wherein said temperature responsive transducer means comprises a thermistor, and wherein said reference signal producing means comprises a potentiometer.
Claim 5
Dependent Claim
31 words
Apparatus according to claim 1 wherein said temperature responsive transducer means comprises a thermistor, wherein said reference signal producing means comprises a potentiometer, and wherein said comparator comprises a differential amplifier.
Claim 6
Dependent Claim
38 words
Apparatus according to claim 1 wherein said humidity responsive transducer means comprises a differential humidity transducer continually responsive to the difference between dew point and said ambient temperature, and wherein said first comparator means comprises a differential amplifier.
Claim 7
Dependent Claim
78 words
Apparatus according to claim 1 wherein said fourth means comprises temperature responsive transducer means responsive to ambient temperature and effective for creating a first variable parameter signal in accordance therewith, Second comparator means adapted to receive said first variable parameter signal and a second signal indicative of the temperature of said surface, said second comparator being effective to create said first variable signal in accordance with the difference between said first variable parameter signal and said second signal.
Claim 8
Dependent Claim
111 words
Apparatus according to claim 1 wherein said fourth means comprises temperature responsive transducer means responsive to ambient temperature and effective for creating a first variable parameter signal in accordance therewith, second comparator means adapted to receive said first variable parameter signal and a second signal indicative of the temperature of said surface, said second comparator being effective to create said first variable signal in accordance with the difference between said first variable parameter signal and said second signal, wherein said humidity responsive transducer means comprises a differential humidity transducer continually responsive to the difference between dew point and said ambient temperature, and wherein said first comparator means comprises a differential amplifier.
Claim 9
Dependent Claim
232 words
Apparatus according to claim 1 wherein said first means comprises temperature responsive thermistor means responsive to said temperature of said surface and effective for producing a first variable signal in accordance therewith, an adjustable potentiometer effective for creating a reference signal indicative of said predetermined temperature, and first comparator means comprising differential amplifier means for receiving said first variable signal and said reference signal, said differential amplifier means being effective to create said first output signal when said first variable signal and said reference signal collectively indicate that said temperature of said surface and said predetermined temperature are equal to each other, wherein said second means comprises second temperature responsive thermistor means responsive to ambient temperature and effective for creating a second variable parameter signal in accordance therewith, second comparator means adapted to receive said second variable signal and said first variable signal, said second comparator being effective to create a third variable signal in accordance with the difference between said first and second variable signals, a differential humidity transducer continually responsive to the difference between ambient temperature and dew point and effective to create a fourth variable signal in accordance therewith, third comparator means responsive to said third and fourth variable signals and effective to create said second output signal when said third and fourth variable signals are equal to each other, and wherein said third means comprises NOR logic circuitry.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |