US3235744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic alternating current switching device
Assignee: Siemens Mobility Ltd
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Filing: 1961-12-06
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Granted: 1966-02-15
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Expires: 1981-12-06
Abstract
No abstract record available.
Inventors
- 👤 Roger J Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:33
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/80; H03K17/82; B; B61; B61L; B61L7/00; B61L7/06; B61L7/068
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
206 words
AN ALTERNATING CURRENT SWITCHING DEVICE COMPRISING: (A) A RECTANGULAR SHAPED CORE OF A MATERIAL HAVING HIGH PERMEABILITY CHARACTERISTICS, (B) A WINDING ARRANGEMENT ON FIRST AND SECOND OPPOSITE LIMBS OF SAID CORE AND CONNECTED IN SERIES WITH A SOURCE OF ALTERNATING CURRENT AND A LOAD, (C) A PERMANENT MAGNET HAVING POLE PIECES SO ARRANGED IN RELATION TO A THIRD LIMB OF SAID CORE AS TO INDUCE FLUX IN A PREDETERMINED DIRECTION IN THE LIMBS OF SAID CORE, AND (D) AN ELECTROMAGNET HAVING A CORE OF A MATERIAL HAVING REMANENT MAGNETIC CHARACTERISTICS AND POLE PIECES ARRANGED IN RELATION TO THE FOURTH LIMB OF THE FIRST MENTIONED CORE SO AS TO INDUCE FLUX IN THE LIMBS OF SUCH CORE IN A DIERCTION TO AID OR OPPOSE THE FLUX INDUCED BY THE PERMANENT MAGNET IN THE LIMBS OF THAT CORE ACCORDING AS A PULSE OF DIRECT CURRENT OF A FIRST OR A SECOND POLARITY IS SUPPLIED TO THE ELECTROMAGNET, THE CORE OF SAID ELECTROMAGNET MAINTAINING A PREDETERMINED FLUX LEVEL UPON THE INTERRUPTION OF SAID PULSE OF DIRECT CURRENT TO CONTROL THE POWER TO SAID LOAD FROM SAID SOURCE OF ALTERNATING CURRENT BETWEEN ON AND OFF STATES ACCORDING TO THE POLARITY OF THE DIRECT CURRENT PULSE LAST SUPPLIED TO SAID ELECTROMAGNET.
Claim 2
Dependent Claim
206 words
AN ALTERNATING CURRENT SWITCHING DEVICE COMPRISING: (A) A RECTANGULAR SHAPED CORE OF A MATERIAL HAVING HIGH PERMEABILITY CHARACTERISTICS, (B) A WINDING ARRANGEMENT ON FIRST AND SECOND OPPOSITE LIMBS OF SAID CORE AND CONNECTED IN SERIES WITH A SOURCE OF ALTERNATING CURRENT AND A LOAD, (C) A PERMANENT MAGNET HAVING POLE PIECES SO ARRANGED IN RELATION TO A THIRD LIMB OF SAID CORE AS TO INDUCE FLUX IN A PREDETERMINED DIRECTION IN THE LIMBS OF SAID CORE, AND (D) AN ELECTROMAGNET HAVING A CORE OF A MATERIAL HAVING REMANENT MAGNETIC CHARACTERISTICS AND POLE PIECES ARRANGED IN RELATION TO THE FOURTH LIMB OF THE FIRST MENTIONED CORE SO AS TO INDUCE FLUX IN THE LIMBS OF SUCH CORE IN A DIERCTION TO AID OR OPPOSE THE FLUX INDUCED BY THE PERMANENT MAGNET IN THE LIMBS OF THAT CORE ACCORDING AS A PULSE OF DIRECT CURRENT OF A FIRST OR A SECOND POLARITY IS SUPPLIED TO THE ELECTROMAGNET, THE CORE OF SAID ELECTROMAGNET MAINTAINING A PREDETERMINED FLUX LEVEL UPON THE INTERRUPTION OF SAID PULSE OF DIRECT CURRENT TO CONTROL THE POWER TO SAID LOAD FROM SAID SOURCE OF ALTERNATING CURRENT BETWEEN ON AND OFF STATES ACCORDING TO THE POLARITY OF THE DIRECT CURRENT PULSE LAST SUPPLIED TO SAID ELECTROMAGNET.
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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |