Patent US3651477A successfully refreshed from Google Patents.
US3287975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature indicator
Assignee: PYROTEL CORP
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Filing: 1963-04-12
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Granted: 1966-11-29
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Expires: 1983-04-12
Abstract
No abstract record available.
Inventors
- 👤 Albert C Mason
- 👤 Cole H Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:29
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/10; G01J5/20; G01J5/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
215 words
A SYSTEM FOR INDICATING THE TEMPERATURE OF A BODY COMPRISING A VARIABLE AUDIO FREQUENCY RELAXATION OSCILLATOR ADAPTED TO BE ENERGIZED BY A D.C. SOURCE, SAID OSCILLATOR INCLUDING: A FIRST TRANSISTOR, A SECOND TRANSISTOR OF OPPOSITE CONDUCTIVITY TYPE OF SAID FIRST TRANSISTOR, SEPARATE LOADS FOR THE EMITTER COLLECTOR PATHS OF SAID TRANSISTORS, MEANS FOR CONNECTING THE EMITTER COLLECTOR PATHS OF SAID TRANSISTORS ACROSS THE TERMINALS OF SAID SOURCE, MEANS FOR COUPLING SIGNALS AT THE COLLECTOR OF EACH TRANSISTOR TO THE BASE OF THE OTHER TRANSISTOR, SAID LAST NAMED MEANS INCLUDING A RESISTANCE CAPACITANCE TIMING CIRCUIT HAVING CONNECTIONS TO THE BASE AND COLLECTOR OF SAID FIRST AND SECOND TRANSISTORS, RESPECTIVELY, SAID TIMING CIRCUIT INCLUDING A VARIABLE RESISTIVE ELEMENT HAVING ITS IMPEDANCE VARIED IN RESPONSE TO THE AMOUNT OF INFRARED ENERGY IMPINGING THEREON FROM SAID BODY, WHEREBY THE FREQUENCY OF THE WAVES GENERATED BY SAID OSCILLATOR IS VARIED IN RESPONSE TO THE IMPEDANCE OF SAID ELEMENT; MEANS RESPONSIVE TO SAID WAVES FOR DERIVING AN AURAL SIGNAL, SAID MEANS FOR DERIVING AN AURAL SIGNAL COMPRISING: RESISTOR MEANS CONNECTED IN SAID LOAD CIRCUIT, A CAPACITOR CONNECTED ACROSS SAID RESISTOR MEANS; AND A SPEAKER HAVING ITS COIL RESPONSIVE TO THE CURRENT THROUGH SAID RESISTOR MEANS; AND MEANS FOR PROVIDING A VISUAL INDICATION OF THE AVERAGE CURRENT FLOW THROUGH SAID RESISTOR MEANS.
Claim 2
Independent Claim
215 words
A SYSTEM FOR INDICATING THE TEMPERATURE OF A BODY COMPRISING A VARIABLE AUDIO FREQUENCY RELAXATION OSCILLATOR ADAPTED TO BE ENERGIZED BY A D.C. SOURCE, SAID OSCILLATOR INCLUDING: A FIRST TRANSISTOR, A SECOND TRANSISTOR OF OPPOSITE CONDUCTIVITY TYPE OF SAID FIRST TRANSISTOR, SEPARATE LOADS FOR THE EMITTER COLLECTOR PATHS OF SAID TRANSISTORS, MEANS FOR CONNECTING THE EMITTER COLLECTOR PATHS OF SAID TRANSISTORS ACROSS THE TERMINALS OF SAID SOURCE, MEANS FOR COUPLING SIGNALS AT THE COLLECTOR OF EACH TRANSISTOR TO THE BASE OF THE OTHER TRANSISTOR, SAID LAST NAMED MEANS INCLUDING A RESISTANCE CAPACITANCE TIMING CIRCUIT HAVING CONNECTIONS TO THE BASE AND COLLECTOR OF SAID FIRST AND SECOND TRANSISTORS, RESPECTIVELY, SAID TIMING CIRCUIT INCLUDING A VARIABLE RESISTIVE ELEMENT HAVING ITS IMPEDANCE VARIED IN RESPONSE TO THE AMOUNT OF INFRARED ENERGY IMPINGING THEREON FROM SAID BODY, WHEREBY THE FREQUENCY OF THE WAVES GENERATED BY SAID OSCILLATOR IS VARIED IN RESPONSE TO THE IMPEDANCE OF SAID ELEMENT; MEANS RESPONSIVE TO SAID WAVES FOR DERIVING AN AURAL SIGNAL, SAID MEANS FOR DERIVING AN AURAL SIGNAL COMPRISING: RESISTOR MEANS CONNECTED IN SAID LOAD CIRCUIT, A CAPACITOR CONNECTED ACROSS SAID RESISTOR MEANS; AND A SPEAKER HAVING ITS COIL RESPONSIVE TO THE CURRENT THROUGH SAID RESISTOR MEANS; AND MEANS FOR PROVIDING A VISUAL INDICATION OF THE AVERAGE CURRENT FLOW THROUGH SAID RESISTOR MEANS.
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |