Patent US3085194A successfully refreshed from Google Patents.
US3085194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Null-balance bridge system
Assignee: Robertshaw Controls Co
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Filing: 1959-02-25
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Granted: 1963-04-09
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Expires: 1979-02-25
Abstract
No abstract record available.
Inventors
- 👤 Revesz George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:25
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN A CONTROL DEVICE, THE COMBINATION COMPRISING A SOURCE OF UNMODULATED ALTERNATING VOLTAGE AT A CARRIER FREQUENCY, A SOURCE OF LOW FREQUENCY MODULATED ALTERNATING VOLTAGE AT A CARRIER FREQUENCY, A BRIDGE CIRCUIT CONNECTED TO SAID SOURCE OF MODULATED VOLTAGE TO PROVIDE A MODULATED VOLTAGE OUTPUT HAVING A PHASE AND AMPLITUDE DEPENDENT ON THE BRIDGE UNBALANCE, MEANS CONNECTED TO RECEIVE SAID UNMODULATED ALTERNATING VOLTAGE AND THE OUTPUT FROM SAID BRIDGE CIRCUIT FOR DERIVING THEREFROM A RESULTANT VOLTAGE OF THE MODULATING LOW FREQUENCY, AND MEANS CONNECTED TO THE OUTPUT OF SAID BRIDGE CIRCUIT FOR LIMITING THE AMPLITUDE OF THE BRIDGE OUTPUT VOLTAGE DURING UNBALANCE TO A MAXIMUM VALUE LESS THAN THE AMPLITUDE OF SAID UNMODULATED ALTERNATING VOLTAGE, TO PREVENT THE RESULTANT VOLTAGE FROM SAID DERIVING MEANS FROM CAUSING A REVERSAL IN PHASE OF THE BRIDGE OUTPUT.
Claim 2
Dependent Claim
134 words
IN A CONTROL DEVICE, THE COMBINATION COMPRISING A SOURCE OF UNMODULATED ALTERNATING VOLTAGE AT A CARRIER FREQUENCY, A SOURCE OF LOW FREQUENCY MODULATED ALTERNATING VOLTAGE AT A CARRIER FREQUENCY, A BRIDGE CIRCUIT CONNECTED TO SAID SOURCE OF MODULATED VOLTAGE TO PROVIDE A MODULATED VOLTAGE OUTPUT HAVING A PHASE AND AMPLITUDE DEPENDENT ON THE BRIDGE UNBALANCE, MEANS CONNECTED TO RECEIVE SAID UNMODULATED ALTERNATING VOLTAGE AND THE OUTPUT FROM SAID BRIDGE CIRCUIT FOR DERIVING THEREFROM A RESULTANT VOLTAGE OF THE MODULATING LOW FREQUENCY, AND MEANS CONNECTED TO THE OUTPUT OF SAID BRIDGE CIRCUIT FOR LIMITING THE AMPLITUDE OF THE BRIDGE OUTPUT VOLTAGE DURING UNBALANCE TO A MAXIMUM VALUE LESS THAN THE AMPLITUDE OF SAID UNMODULATED ALTERNATING VOLTAGE, TO PREVENT THE RESULTANT VOLTAGE FROM SAID DERIVING MEANS FROM CAUSING A REVERSAL IN PHASE OF THE BRIDGE OUTPUT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-08 | 1966-10-08 | 1967-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-08 | 1970-10-08 | 1971-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-08 | 1974-10-08 | 1975-04-09 | $7700.00 | Window Closed / Lapsed |