Patent US3609731A successfully refreshed from Google Patents.
US3609731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Revertible temperature detector
Assignee: Raychem Corp
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Filing: 1968-08-15
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Granted: 1971-09-28
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Expires: 1988-08-15
Abstract
Abstract A rapid, sensitive, revertible temperature monitoring system using a substantial change in impedance of a medium to a signal at a temperature-dependent change of physical condition, e.g., a change of state. In particular a system in which the transmission of ultrasonic waves through a meltable wire is monitored to indicate the temperature of the environment.
Inventors
- 👤 Joseph H Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:56
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/11; G01K; G01K1/00; G01K1/02; G01K1/024
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
A temperature monitoring system comprising a signal generator, a signal receiver, a meltable solid medium capable of transmitting a signal from said generator to said receiver, said medium exhibiting a substantial change in impedance to said signal at a given temperature, and means for indicating a substantial change in the strength of the signal received by said receiver, the impedance to said signal changing substantially at the melting point of said solid, said system also comprising means for maintaining continuity of said medium while said medium is liquid.
Claim 2
Dependent Claim
88 words
A temperature monitoring system comprising a signal generator, a signal receiver, a meltable solid medium capable of transmitting a signal from said generator to said receiver, said medium exhibiting a substantial change in impedance to said signal at a given temperature, and means for indicating a substantial change in the strength of the signal received by said receiver, the impedance to said signal changing substantially at the melting point of said solid, said system also comprising means for maintaining continuity of said medium while said medium is liquid.
Claim 3
Dependent Claim
16 words
A temperature monitoring system as claimed in claim 1 wherein said meltable solid is solder wire.
Claim 4
Dependent Claim
29 words
A temperature monitoring system as claimed in claim 2 where said continuity maintaining means comprises a plastic tube which is elastomeric at the melting temperature of said solder wire.
Claim 5
Dependent Claim
88 words
A temperature monitoring device comprising an ultrasonic wave generator, a receiver for ultrasonic waves, means for indicating when said receiver is receiving ultrasonic waves, and a continuous medium connecting said generator and said receiver, said medium exhibiting a substantial change in its impedance to ultrasonic waves at a given surrounding temperature and said medium comprising a meltable solid, the impedance of which to ultrasonic waves increases substantially at its melting temperature, said system also comprising means for maintaining the continuity of the medium while in the liquid state.
Claim 6
Dependent Claim
88 words
A temperature monitoring device comprising an ultrasonic wave generator, a receiver for ultrasonic waves, means for indicating when said receiver is receiving ultrasonic waves, and a continuous medium connecting said generator and said receiver, said medium exhibiting a substantial change in its impedance to ultrasonic waves at a given surrounding temperature and said medium comprising a meltable solid, the impedance of which to ultrasonic waves increases substantially at its melting temperature, said system also comprising means for maintaining the continuity of the medium while in the liquid state.
Claim 7
Dependent Claim
62 words
A temperature monitoring device comprising an ultrasonic wave generator, a receiver for ultrasonic waves, means for indicating whEn said receiver is receiving ultrasonic waves, and a continuous medium connecting said generator and said receiver, said medium exhibiting a substantial change in its impedance to ultrasonic waves at a given surrounding temperature and said medium comprising a meltable wire incapsulated in a tube.
Claim 8
Dependent Claim
62 words
A temperature monitoring device comprising an ultrasonic wave generator, a receiver for ultrasonic waves, means for indicating whEn said receiver is receiving ultrasonic waves, and a continuous medium connecting said generator and said receiver, said medium exhibiting a substantial change in its impedance to ultrasonic waves at a given surrounding temperature and said medium comprising a meltable wire incapsulated in a tube.
Claim 9
Dependent Claim
16 words
A temperature monitoring system as claimed in claim 5 wherein said wire is a solder wire.
Claim 10
Dependent Claim
16 words
A temperature monitoring system as claimed in claim 5 wherein said tube is a heat-shrinkable tube.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |