US3665484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording systems
Assignee: Fujitsu Services Ltd
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Filing: 1970-07-30
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Granted: 1972-05-23
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Expires: 1990-07-30
Abstract
Abstract A magnetic recording apparatus in which fixed information, which may be an outline of a business form, is recorded as a predetermined pattern on a magnetizable member. A magnetic recording member is separated from the magnetizable member by a screening member which includes a plurality of magnetic elements thereon. The magnetic elements are positioned on a backing layer and selectively prevent the magnetic field produced by the recording means from changing the magnetic state of the magnetizable member so that the predetermined pattern is recorded on the magnetizable member. The screening member may also include further small magnetic materials to increase the number of magnetic fringe fields which will allow a more uniform change of state of areas of the magnetizable member.
Inventors
- 👤 Alan Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:44
CPC Classifications
G; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
An apparatus for recording a predetermined magnetic pattern on a magnetizable member; including a recording member positioned adjacent the magnetizable member for producing a magnetic field; means for producing relative movement between the recording member and the magnetizable member; and a screening member interposable between the recording and magnetizably members thereby selectively to prevent the magnetic field from changing the magnetic state of the magnetizable member so that the predetermined pattern is recorded on the magnetic member, said screening member comprising a backing member and a plurality of first and second groups of magnetic elements provided on the backing member such that the elements of each second group are located between successive elements of a first group.
Claim 2
Independent Claim
117 words
An apparatus for recording a predetermined magnetic pattern on a magnetizable member; including a recording member positioned adjacent the magnetizable member for producing a magnetic field; means for producing relative movement between the recording member and the magnetizable member; and a screening member interposable between the recording and magnetizably members thereby selectively to prevent the magnetic field from changing the magnetic state of the magnetizable member so that the predetermined pattern is recorded on the magnetic member, said screening member comprising a backing member and a plurality of first and second groups of magnetic elements provided on the backing member such that the elements of each second group are located between successive elements of a first group.
Claim 3
Dependent Claim
38 words
An apparatus as claimed in claim 1 in which said recording member includes a conductor which passes through a core of magnetic material with the variations of current in said conductor causing corresponding variations in said magnetic field.
Claim 4
Dependent Claim
16 words
An apparatus as claimed in claim 1 in which said recording member is a permanent magnet.
Claim 5
Dependent Claim
60 words
An apparatus as claimed in claim 1 in which said screening member is comprised of a backing layer with a plurality of electrically conductive, non-magnetic elements selectivelY positioned on said backing layer and whereby said electrically conductive elements effectively prevent said magnetic field from changing the magnetic state of those portions of the magnetizable member corresponding to said conductive elements.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |