US4270156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic synchronization monitor
Assignee: General Equipment and Manufacturing Co Inc
•
Filing: 1979-04-09
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Granted: 1981-05-26
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Expires: 1999-04-09
Abstract
Abstract An electronic sensing circuit monitoring the voltage on each of two alternating current power lines indicates when a load may be transferred from one of the power lines to the other without generating undesirable transient voltages or currents in the load.
Inventors
- 👤 Warren C. Fry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:14
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/18; H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/061
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
An electronic power line synchronization monitor comprising, in combination, a first rectifier connected to a first of two power lines being monitored, a second rectifier connected to a second of two power lines being monitored, a first electronic switch that is conductive during alternate half cycles of the voltage on the first power line, a second electronic switch that is conductive during alternate half cycles of the voltage on the second power line, a condenser that is connected through a resistor to said rectifiers, said electronic switches being connected to and arranged to discharge said condenser when conductive, and indicating means powered by said rectifiers and connected to said condenser for indicating a rise in voltage on said condenser.
Claim 2
Dependent Claim
119 words
An electronic power line synchronization monitor comprising, in combination, a first rectifier connected to a first of two power lines being monitored, a second rectifier connected to a second of two power lines being monitored, a first electronic switch that is conductive during alternate half cycles of the voltage on the first power line, a second electronic switch that is conductive during alternate half cycles of the voltage on the second power line, a condenser that is connected through a resistor to said rectifiers, said electronic switches being connected to and arranged to discharge said condenser when conductive, and indicating means powered by said rectifiers and connected to said condenser for indicating a rise in voltage on said condenser.
Claim 3
Dependent Claim
15 words
A synchronization monitor according to claim 1 in which the indicating means comprises a relay.
Claim 4
Dependent Claim
88 words
In a synchronization monitor according to claim 1, a third electronic switch arranged to be conductive during alternate half cycles of the voltage on the first power line, a fourth electronic switch arranged to be conductive during alternate half cycles of the voltage on the second power line, a condenser in parallel with each of the third and fourth electronic switches, means for charging the condensers, said switches being arranged to discharge the associated condenser when conductive, and means connected to said condensers for energizing said indicating means.
References Cited (Backward Citations)
US3562545A
Cited
US3588519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |