US3139579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-balancing simulated bridge circuit for measuring impedance
Assignee: General Electric Co
•
Filing: 1959-10-27
•
Granted: 1964-06-30
•
Expires: 1979-10-27
Abstract
No abstract record available.
Inventors
- 👤 Jean-Paul J Gravel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:44
CPC Classifications
G; G01; G01R; G01R17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
AN ELECTRICAL MEASURING APPARATUS COMPRISING: FIRST AND SECOND IMPEDANCE ELEMENTS SERIALLY CONNECTED BETWEEN A FIRST SOURCE OF POTENTIAL OF ONE POLARITY AND A SECOND SOURCE OF POTENTIAL OF A SECOND POLARITY; MEANS CONNECTED TO A JUNCTION BETWEEN SAID FIRST AND SECOND IMPEDANCE ELEMENTS FOR AMPLIFYING A POTENTIAL THEREAT; MEANS COMPRISING AN ACTIVE ELEMENT CONNECTED TO AN OUTPUT TERMINAL OF SAID AMPLIFYING MEANS FOR INVERTING A VOLTAGE SIGNAL THEREFROM AND FOR ALGEBRAICALLY ADDING THE INVERTED VOLTAGE SIGNAL TO A POTENTIAL FROM SAID SECOND SOURCE WHEREBY SAID JUNCTION IS MAINTAINED AT A SUBSTANTIALLY ZERO
Claim 2
Dependent Claim
92 words
AN ELECTRICAL MEASURING APPARATUS COMPRISING: FIRST AND SECOND IMPEDANCE ELEMENTS SERIALLY CONNECTED BETWEEN A FIRST SOURCE OF POTENTIAL OF ONE POLARITY AND A SECOND SOURCE OF POTENTIAL OF A SECOND POLARITY; MEANS CONNECTED TO A JUNCTION BETWEEN SAID FIRST AND SECOND IMPEDANCE ELEMENTS FOR AMPLIFYING A POTENTIAL THEREAT; MEANS COMPRISING AN ACTIVE ELEMENT CONNECTED TO AN OUTPUT TERMINAL OF SAID AMPLIFYING MEANS FOR INVERTING A VOLTAGE SIGNAL THEREFROM AND FOR ALGEBRAICALLY ADDING THE INVERTED VOLTAGE SIGNAL TO A POTENTIAL FROM SAID SECOND SOURCE WHEREBY SAID JUNCTION IS MAINTAINED AT A SUBSTANTIALLY ZERO
References Cited (Backward Citations)
US2623929A
Cited
US2911829A
Cited
US2904753A
Cited
US2786169A
Cited
US2968180A
Cited
US2972106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |