US3423742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reluctance-type transducer device
Assignee: NCR Voyix Corp
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Filing: 1963-08-12
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Granted: 1969-01-21
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Expires: 1983-08-12
Abstract
No abstract record available.
Inventors
- 👤 Douglas H Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:41
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/08; G06K7/082; G06K7/083; G06K7/084; G06K7/087; G11; G11B; G11B5/00; G11B5/127; G11B5/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
A TRANSDUCER CIRCUIT DEVICE FOR DEVELOPING ELECTRICAL WAVE SHAPES CHARACTERISTIC OF DIFFERENT MAGNETIC CHARACTERS CARRIED BY A DOCUMENT, COMPRISING: AN ELECTROMAGNETIC TRANSDUCER HEAD INCLUDING A CORE HAVING A PAIR OF SPACED POLE PORTIONS DEFINING A NONMAGNETIC GAP, AND A READING COIL INCLUDING A PAIR OF WINDINGS HAVING OPPOSITE MAGNETIC ORIENTATION, EACH WINDING BEING MOUNTED ON ONE OF SAID POLE PORTIONS, SAID CORE, SAID POLE PORTIONS, AND SAID GAP FORMING A SERIES MAGNETIC CIRCUIT THROUGH SAID PAIR OF WINDINGS; AND A HIGH IMPEDANCE UNIDIRECTIONAL CURRENT SOURCE CONNECTED IN PARALLEL WITH SAID READING COIL FOR PRODUCING A STABLE MAGNETIC FLUX CONDITION IN SAID MAGNETIC CIRCUIT, SAID CURRENT SOURCE HAVING A HIGH OUTPUT IMPENDANCE WHICH VARIES IN SUBSTANTIALLY INVERSE PROPORTION TO ITS OUTPUS CURRENT AND WHICH IS GREATER THAN ANY OTHER IMPEDANCE IN SAID TRANSDUCER CIRCUIT DEVICE SO AS NOT TO CHANGE THE FREQUENCY RESPONSE CHARACTERISTICS OF SAID TRANSDUCER CIRCUIT DEVICE BY LOADING OF SAID READING COIL, WHEREBY WHEN SAID DOCUMENT IS MOVED RELATIVE TO SAID HEAD, SAID MAGNETIC CHARACTERS CASUE THE RELUCTANCE OF SAID MAGNETIC CIRCUIT TO VARY, THEREBY DEVELOPING IN SAID READING COIL ELECTRICAL WAVE SHAPES CHARACTERISTIC OF SAID CHARACTERS.
Claim 2
Dependent Claim
189 words
A TRANSDUCER CIRCUIT DEVICE FOR DEVELOPING ELECTRICAL WAVE SHAPES CHARACTERISTIC OF DIFFERENT MAGNETIC CHARACTERS CARRIED BY A DOCUMENT, COMPRISING: AN ELECTROMAGNETIC TRANSDUCER HEAD INCLUDING A CORE HAVING A PAIR OF SPACED POLE PORTIONS DEFINING A NONMAGNETIC GAP, AND A READING COIL INCLUDING A PAIR OF WINDINGS HAVING OPPOSITE MAGNETIC ORIENTATION, EACH WINDING BEING MOUNTED ON ONE OF SAID POLE PORTIONS, SAID CORE, SAID POLE PORTIONS, AND SAID GAP FORMING A SERIES MAGNETIC CIRCUIT THROUGH SAID PAIR OF WINDINGS; AND A HIGH IMPEDANCE UNIDIRECTIONAL CURRENT SOURCE CONNECTED IN PARALLEL WITH SAID READING COIL FOR PRODUCING A STABLE MAGNETIC FLUX CONDITION IN SAID MAGNETIC CIRCUIT, SAID CURRENT SOURCE HAVING A HIGH OUTPUT IMPENDANCE WHICH VARIES IN SUBSTANTIALLY INVERSE PROPORTION TO ITS OUTPUS CURRENT AND WHICH IS GREATER THAN ANY OTHER IMPEDANCE IN SAID TRANSDUCER CIRCUIT DEVICE SO AS NOT TO CHANGE THE FREQUENCY RESPONSE CHARACTERISTICS OF SAID TRANSDUCER CIRCUIT DEVICE BY LOADING OF SAID READING COIL, WHEREBY WHEN SAID DOCUMENT IS MOVED RELATIVE TO SAID HEAD, SAID MAGNETIC CHARACTERS CASUE THE RELUCTANCE OF SAID MAGNETIC CIRCUIT TO VARY, THEREBY DEVELOPING IN SAID READING COIL ELECTRICAL WAVE SHAPES CHARACTERISTIC OF SAID CHARACTERS.
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) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |