Patent US3107347A successfully refreshed from Google Patents.
US3107347A
Expired / Lapsed
US
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Magnetic field compensation means
Assignee: Unisys Corp
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Filing: 1961-07-10
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Granted: 1963-10-15
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Expires: 1981-07-10
Abstract
No abstract record available.
Inventors
- 👤 Steven J Huss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/0007; G11B5/00; G11B5/127; G11B5/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A REVOLVER CIRCUIT HAVING A RECORDING AND READBACK HEAD DISPOSED IN JUXTAPOSITION TO A MOVING MAGNETIZABLE MEMBER WITH THE REPRODUCING HEAD BEING DOWNSTREAM WITH RESPECT TO THE RECORDING HEAD, THE HEAD BEING SPACES IN CLOSE PROXIMITY AND EACH HAVING COILS BEING INTERCOUPLED BY MUTUAL INDUCTANCE SUCH THAT A RECORDING CURRENT IN THE RECORDING COIL INDUCES A SUBSTANTIALLY VOLTAGE IN THE REPRODUCING HEAD COIL, A THIRD COIL DISPOSED DOWNSTREAM FROM THE REPRODUCING HEAD AND BEING IN A NONRECORDING RELATIONSHIP TO THE MAGNETIZABLE MEMBER AND HAVING MUTUAL INDUCTANCE WITH THE REPRODUCING HEAD COIL, AND THE THIRD COIL BEING ELECTRICALLY CONNECTED TO THE RECORDING HEAD COIL AND SUCH THAT RECORDING CURRENT WILL FLOW THROUGH BOTH THE HEAD AND THE THIRD COIL SUCH THAT THE RESULTING FLUXES CANCEL EACH OTHER IN THE REPRODUCING HEAD BECAUSE OF THE MUTUAL INDUCTANCES.
Claim 2
Dependent Claim
135 words
A REVOLVER CIRCUIT HAVING A RECORDING AND READBACK HEAD DISPOSED IN JUXTAPOSITION TO A MOVING MAGNETIZABLE MEMBER WITH THE REPRODUCING HEAD BEING DOWNSTREAM WITH RESPECT TO THE RECORDING HEAD, THE HEAD BEING SPACES IN CLOSE PROXIMITY AND EACH HAVING COILS BEING INTERCOUPLED BY MUTUAL INDUCTANCE SUCH THAT A RECORDING CURRENT IN THE RECORDING COIL INDUCES A SUBSTANTIALLY VOLTAGE IN THE REPRODUCING HEAD COIL, A THIRD COIL DISPOSED DOWNSTREAM FROM THE REPRODUCING HEAD AND BEING IN A NONRECORDING RELATIONSHIP TO THE MAGNETIZABLE MEMBER AND HAVING MUTUAL INDUCTANCE WITH THE REPRODUCING HEAD COIL, AND THE THIRD COIL BEING ELECTRICALLY CONNECTED TO THE RECORDING HEAD COIL AND SUCH THAT RECORDING CURRENT WILL FLOW THROUGH BOTH THE HEAD AND THE THIRD COIL SUCH THAT THE RESULTING FLUXES CANCEL EACH OTHER IN THE REPRODUCING HEAD BECAUSE OF THE MUTUAL INDUCTANCES.
References Cited (Backward Citations)
US2351008A
Cited
US2689274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-14 | 1967-04-15 | 1967-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-14 | 1971-04-15 | 1971-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-14 | 1975-04-15 | 1975-10-15 | $7700.00 | Window Closed / Lapsed |