US3570313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric resistance thermometer
Assignee: F Hoffmann La Roche AG
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Filing: 1969-11-12
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Granted: 1971-03-16
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Expires: 1989-11-12
Abstract
Abstract AN ELECTRICAL RESISTANCE THERMOTER DEVICE HAVING A RESISTANCE SENSING UNIT FORMING PART OF A BALANCING CIRCUIT WITH A CALIBRATED TEMPERATURE READOUT DIAL, AND A BALANCING DETECTOR HAVING AN AMPLIFIER CIRCUIT OPERABLE AT DIFFERENT LEVELS OF SENSITIVITY FOR DRIVING A CURRENT PASSING THROUGH A LAMP INDICATOR AT LOW AND HIGH CURRENT LEVELS AND THUS PROVIDING DIM AND BRIGHT LIGHT INTENSITY VALUES, SO THAT THE LAMP GIVES A DIM INDICATION WHEN THE BALANCE DETECTOR NEARS BALANCE AND A BRIGHT INDICATION WHEN THE BALANCE DETECTOR IS AT BALANCE. A PROBE CARRYING THE SENSING UNIT IS MOUNTED FOR RECIPROCATING MOVEMENT IN AND OUT FROM THE DEVICE HOUSING.
Inventors
- 👤 Ulrich Anton Frank
- 👤 Carlton Stanley Tegge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:37
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/16; G01K7/18; G01K7/20; G01K7/206
Claims Analysis
Total Claims: 0
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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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |