US3228018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signalling switch gear
Assignee: Stamicarbon BV
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Filing: 1962-09-18
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Granted: 1966-01-04
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Expires: 1982-09-18
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Benjaminsen
- 👤 Henricus H M Hamelers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:13
CPC Classifications
G; G08; G08B; G08B21/00; H; H02; H02H; H02H3/00; H02H3/44; H04; H04Q; H04Q9/00; H04Q9/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A SIGNALLING CIRCUIT TO DETECT SUDDEN TRANSIENT ELECTRICAL CURRENTS WITHIN AN ELECTRICAL SYSTEM HAVING A PLURALITY OF LINES THEREIN, SAID TRANSIENT CURRENTS BEING CREATED BY ABRUPT CHANGES OF STEADY-STATE CURRENTS IN SAID LINES, COMPRISING: A TRANSFORMER HAVING A PRIMARY AND SECONDARY WINDING, A SHUNT LINE INCLUDING SAID PRIMARY WINDING COUPLED ACROSS TWO POINTS OF SAID SYSTEM, AN IMPEDANCE CONNECTED BETWEEN SAID TWO POINTS AND JOINED IN SERIES WITH SAID PLURALITY OF LINES, SAID IMPEDANCE BEING CHARACTERIZED BY HAVING A LOW VALUE WITH RESPECT TO SAID SHUNT LINE DURING STEADY-STATE OPERATION AND A HIGH VALUE WITH RESPECT TO THE SHUNT LINE DURING TRANSIENT PERIODS WITHIN SAID SYSTEM; AT LEAST ONE OUTPUT DEVICE COUPLED TO SAID SECONDARY WINDING; NON-CAPACTIVE IMPEDANCES IN SERIES WITH EACH OF SAID PLURALITY OF LINES, AND CAPACITIVE MEANS IN PARALLEL WITH SAID NON-CAPACITIVE IMPEDANCES FOR PROVIDING A PATH FOR TRANSIENT CURRENTS AROUND SAID NONCAPACITIVE IMPEDANCES AND THROUGH SAID PRIMARY WINDING TO THEREBY ENERGIZE SAID SECONDARY WINDING AND SAID OUTPUT DEVICE.
Claim 2
Dependent Claim
162 words
A SIGNALLING CIRCUIT TO DETECT SUDDEN TRANSIENT ELECTRICAL CURRENTS WITHIN AN ELECTRICAL SYSTEM HAVING A PLURALITY OF LINES THEREIN, SAID TRANSIENT CURRENTS BEING CREATED BY ABRUPT CHANGES OF STEADY-STATE CURRENTS IN SAID LINES, COMPRISING: A TRANSFORMER HAVING A PRIMARY AND SECONDARY WINDING, A SHUNT LINE INCLUDING SAID PRIMARY WINDING COUPLED ACROSS TWO POINTS OF SAID SYSTEM, AN IMPEDANCE CONNECTED BETWEEN SAID TWO POINTS AND JOINED IN SERIES WITH SAID PLURALITY OF LINES, SAID IMPEDANCE BEING CHARACTERIZED BY HAVING A LOW VALUE WITH RESPECT TO SAID SHUNT LINE DURING STEADY-STATE OPERATION AND A HIGH VALUE WITH RESPECT TO THE SHUNT LINE DURING TRANSIENT PERIODS WITHIN SAID SYSTEM; AT LEAST ONE OUTPUT DEVICE COUPLED TO SAID SECONDARY WINDING; NON-CAPACTIVE IMPEDANCES IN SERIES WITH EACH OF SAID PLURALITY OF LINES, AND CAPACITIVE MEANS IN PARALLEL WITH SAID NON-CAPACITIVE IMPEDANCES FOR PROVIDING A PATH FOR TRANSIENT CURRENTS AROUND SAID NONCAPACITIVE IMPEDANCES AND THROUGH SAID PRIMARY WINDING TO THEREBY ENERGIZE SAID SECONDARY WINDING AND SAID OUTPUT DEVICE.
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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |