US3100397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrometer apparatus
Assignee: ILLINOIS TESTING LABORATORIES
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Filing: 1958-03-05
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Granted: 1963-08-13
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Expires: 1978-03-05
Abstract
No abstract record available.
Inventors
- 👤 Veikko K Peltola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:31
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/10; G01K7/12; G01K7/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PYROMETER APPARATUS COMPRISING A THERMOCOUPLE OF LOW IMPEDANCE, A MOVING COIL GALVANOMETER HAVING A HIGH CRITICAL DAMPING RESISTANCE, AND AN ACTIVE SEMICONDUCTOR DEVICE ACTING AS AN IMPEDANCE CONVERTER AND AMPLIFIER CONNECTED BETWEEN THE THERMOCOUPLE AND GALVANOMETER, THE INPUT CIRCUIT OF THE SEMI-CONDUCTOR DEVICE HAVING A RESISTANCE ELEMENT AND SAID THERMOCOUPLE CONNECTED IN SERIES THEREIN, WITH THE RESISTANCE ELEMENT HAVING AN IMPEDANCE SUBSTANTIALLY HIGHER THAN THE IMPEDANCE OF THE THERMOCOUPLE WHEREBY CHANGES IN THE IMPEDANCE OF THE INPUT CIRCUIT WILL HAVE NEGLIGIBLE EFFECT UPON THE RESPONSE OF THE GALVANOMETER.
Claim 2
Dependent Claim
89 words
A PYROMETER APPARATUS COMPRISING A THERMOCOUPLE OF LOW IMPEDANCE, A MOVING COIL GALVANOMETER HAVING A HIGH CRITICAL DAMPING RESISTANCE, AND AN ACTIVE SEMICONDUCTOR DEVICE ACTING AS AN IMPEDANCE CONVERTER AND AMPLIFIER CONNECTED BETWEEN THE THERMOCOUPLE AND GALVANOMETER, THE INPUT CIRCUIT OF THE SEMI-CONDUCTOR DEVICE HAVING A RESISTANCE ELEMENT AND SAID THERMOCOUPLE CONNECTED IN SERIES THEREIN, WITH THE RESISTANCE ELEMENT HAVING AN IMPEDANCE SUBSTANTIALLY HIGHER THAN THE IMPEDANCE OF THE THERMOCOUPLE WHEREBY CHANGES IN THE IMPEDANCE OF THE INPUT CIRCUIT WILL HAVE NEGLIGIBLE EFFECT UPON THE RESPONSE OF THE GALVANOMETER.
References Cited (Backward Citations)
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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) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |