Patent US2413303A successfully refreshed from Google Patents.
US3210539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System responsive to the displacement of metallic objects
Assignee: Societe Industrielle de Liaisons Electriques SA
•
Filing: 1960-03-04
•
Granted: 1965-10-05
•
Expires: 1980-03-04
Abstract
No abstract record available.
Inventors
- 👤 Malaquin Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:32
CPC Classifications
B; B61; B61L; B61L1/00; B61L1/16; B61L1/163; B61L1/165; B61L1/02; B61L1/10; G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/104; G01V3/105; G01V3/107
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A SYSTEM FOR DETECTING AND SIGALLING THE PASSAGE OF A RAILWAY WHEEL COMPRISING AN INDUCTIVE DETECTING DEVICE INCLUDING PRIMARY COIL MEANS, A SOURCE OF ALTERNATING CURRENT COUPLED TO SAID PRIMARY COIL MEANS AND TWO SECONDARY COILS ELECTRICALLY CONNECTED IN SERIES OPPOSITION AND DISPOSED ALONG THE PASSAGE OF SAID WHEEL WITH SAID PRIMARY COIL MEANS THEREBETWEEN, SAID SECONDARY COILS HAVING DIFFERENT INDUCTIVE RELATIONS WITH SAID PRIMARY COIL MEANS SO THAT THE SECONDARY COILS HAVE INDUCED THEREIN IN THE ABSENCE OF THE WHEEL UNBALANCED ELECTROMOTIVE FORCES THEREBY PROVIDING A CONTROL CURRENT, SAID CONTROL CURRENT DECREASING WITH SAID WHEEL APPROACHING SAID DEVICE IN A FIRST DIRECTION AND INCREASING WITH SAID WHEEL APPROACHING SAID DEVICE IN AN OPPOSITE DIRECTION, SIGNALLING MEANS RESPONSIVE TO SAID CONTROL CURRENT FOR PRODUCING A SIGNAL WITH SAID CONTROL CURRENT DECREASED, AND MEANS RESPONISVE TO SAID CONTROL CURRENT FOR RENDERING SAID SIGNALLING MEANS INEFFECTIVEUPON INCREASE IN THE CONTROL CURRENT.
Claim 2
Independent Claim
149 words
A SYSTEM FOR DETECTING AND SIGALLING THE PASSAGE OF A RAILWAY WHEEL COMPRISING AN INDUCTIVE DETECTING DEVICE INCLUDING PRIMARY COIL MEANS, A SOURCE OF ALTERNATING CURRENT COUPLED TO SAID PRIMARY COIL MEANS AND TWO SECONDARY COILS ELECTRICALLY CONNECTED IN SERIES OPPOSITION AND DISPOSED ALONG THE PASSAGE OF SAID WHEEL WITH SAID PRIMARY COIL MEANS THEREBETWEEN, SAID SECONDARY COILS HAVING DIFFERENT INDUCTIVE RELATIONS WITH SAID PRIMARY COIL MEANS SO THAT THE SECONDARY COILS HAVE INDUCED THEREIN IN THE ABSENCE OF THE WHEEL UNBALANCED ELECTROMOTIVE FORCES THEREBY PROVIDING A CONTROL CURRENT, SAID CONTROL CURRENT DECREASING WITH SAID WHEEL APPROACHING SAID DEVICE IN A FIRST DIRECTION AND INCREASING WITH SAID WHEEL APPROACHING SAID DEVICE IN AN OPPOSITE DIRECTION, SIGNALLING MEANS RESPONSIVE TO SAID CONTROL CURRENT FOR PRODUCING A SIGNAL WITH SAID CONTROL CURRENT DECREASED, AND MEANS RESPONISVE TO SAID CONTROL CURRENT FOR RENDERING SAID SIGNALLING MEANS INEFFECTIVEUPON INCREASE IN THE CONTROL CURRENT.
References Cited (Backward Citations)
US881005A
Cited
US1702997A
Cited
US2045923A
Cited
DE885866C
Cited
FR896657A
Cited
GB788453A
Cited
US2892078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |