US3308375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale span changing input circuit for self-balancing instrument
Assignee: Hitachi Ltd
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Filing: 1963-11-26
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Granted: 1967-03-07
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Expires: 1983-11-26
Abstract
No abstract record available.
Inventors
- 👤 Numakura Toshio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:32
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/625; G05F1/63; G05F1/648
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN A SELF-BALANCING INSTRUMENT OF THE TYPE EMPLOYING A POTENTIOMETER HAVING A MOVABLE CONTACT FOR VARYING THE OUTPUT POTENTIAL DERIVED THEREFROM AND A SERVO-AMPLIFIER CONTROLLING THE OUTPUT OF THE POTENTIOMETER, THE IMPROVEMENT COMPRISING A SCALE SPAN CHANGING INPUT CIRCUIT INCLUDING A FIRST VARIABLE IMPEDANCE CONNECTED IN SERIES CIRCUIT RELATIONSHIP WITH AN INPUT SIGNAL SOURCE WHOSE MAGNITUDE IS TO BE MEASURED ACROSS THE INPUT TO THE SERVOAMPLIFIER, AND A SECOND VARIABLE IMPEDANCE CONNECTED IN SERIES CIRCUIT RELATIONSHIP WITH THE OUTPUT FROM THE POTENTIOMETER ACROSS THE FIRST VARIABLE IMPEDANCE TO FORM A PARALLEL COMPENSATION NETWORK IN A MANNER SUCH THAT THE INPUT SIGNAL SOURCE AND THE PARALLEL COMPENSATION NETWORK COMPRISED BY THE FIRST AND SECOND VARIABLE IMPEDANCES AND THE OUTPUT FROM THE POTENTIOMETER ARE CONNECTED IN SERIES CIRCUIT RELATIONSHIP ACROSS THE INPUT TO THE SERVO AMPLIFIER.
Claim 2
Dependent Claim
134 words
IN A SELF-BALANCING INSTRUMENT OF THE TYPE EMPLOYING A POTENTIOMETER HAVING A MOVABLE CONTACT FOR VARYING THE OUTPUT POTENTIAL DERIVED THEREFROM AND A SERVO-AMPLIFIER CONTROLLING THE OUTPUT OF THE POTENTIOMETER, THE IMPROVEMENT COMPRISING A SCALE SPAN CHANGING INPUT CIRCUIT INCLUDING A FIRST VARIABLE IMPEDANCE CONNECTED IN SERIES CIRCUIT RELATIONSHIP WITH AN INPUT SIGNAL SOURCE WHOSE MAGNITUDE IS TO BE MEASURED ACROSS THE INPUT TO THE SERVOAMPLIFIER, AND A SECOND VARIABLE IMPEDANCE CONNECTED IN SERIES CIRCUIT RELATIONSHIP WITH THE OUTPUT FROM THE POTENTIOMETER ACROSS THE FIRST VARIABLE IMPEDANCE TO FORM A PARALLEL COMPENSATION NETWORK IN A MANNER SUCH THAT THE INPUT SIGNAL SOURCE AND THE PARALLEL COMPENSATION NETWORK COMPRISED BY THE FIRST AND SECOND VARIABLE IMPEDANCES AND THE OUTPUT FROM THE POTENTIOMETER ARE CONNECTED IN SERIES CIRCUIT RELATIONSHIP ACROSS THE INPUT TO THE SERVO AMPLIFIER.
References Cited (Backward Citations)
US2835856A
Cited
GB867851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |