US3372332A
Expired / Lapsed
US
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Method and apparatus for electrical resistance measurement
Assignee: Imperial Chemical Industries Ltd
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Filing: 1965-07-19
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Granted: 1968-03-05
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Expires: 1985-07-19
Abstract
No abstract record available.
Inventors
- 👤 Michell Peter Ralph
- 👤 Packham Frederick George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:02
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/28; C; C25; C25B; C25B15/00; C25B15/04; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/045; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
156 words
AN APPARATUS SUITABLE FOR MEASURING THE ELECTRICAL RESISTANCE OF A CIRCUIT ELEMENT WHICH IS CARRYING A DIRECT CURRENT, WHICH COMPRISES A VOLTAGE-OPERATED DIRECT CURRENT GENERATOR, A POTENTIOMETER RESISTOR HAVING AN ADJUSTABLE TAPPING, A VOLTAGE AMPLIFIER, A SERVO-MECHANISM AND AN INDICATOR SCALE, SAID VOLTAGE-OPERATED CURRENT GENERATOR BEING CONNECTED FOR RECEIVING AN EXTERNALLY APPLIED FIRST INPUT VOLTAGE AND FOR FEEDING THE WHOLE OR PART OF A CURRENT OUTPUT THROUGH THE SAID POTENTIOMETER RESISTOR, SAID ADJUSTABLE TAPPING ON THE POTENTIOMETER RESISTOR BEING CONNECTED FOR APPLYING TO THE INPUT TERMINALS OF THE SAID VOLTAGE AMPLIFIER IN SERIES OPPOSITION TO A SECOND EXTERNALLY APPLIED INPUT VOLTAGE A FRACTION OF THE VOLTAGE DEVELOPED ACROSS THE POTENTIOMETER RESISTOR, SAID SERVOMECHANISM BEING MECHANICALLY CONNECTED TO THE SAID POTENTIOMETER TAPPING AND TO THE SAID INDICATOR SCALE AND BEING ELECTRICALLY LINKED WITH THE OUTPUT TERMINALS OF THE SAID VOLTAGE AMPLIFIER IN SUCH A SENSE THAT WHEN THERE IS AN OUTPUT FROM THE VOLTAGE AMPLIFIER THE SERVO-MECHANISM
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) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |