Patent US4072957A successfully refreshed from Google Patents.
US4072957A
Expired / Lapsed
US
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Non-impact printing system with magnetic recording apparatus and method
Assignee: Iwatsu Electric Co Ltd
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Filing: 1976-01-22
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Granted: 1978-02-07
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Expires: 1996-01-22
Abstract
Abstract A magnetic recording method and apparatus is disclosed. The magnetic recording method includes forming a magnetic latent image on a recording medium with a scanning recording head so that the magnetic latent image has substantially the same width as that of the recording head, recording the magnetic latent image again with the recording head shifted from its first position by a predetermined width to cause overlapping to form a magnetic latent image with a predetermined width narrower than the width of the recording head and making the narrowed magnetic latent image visible.
Inventors
- 👤 Norio Kokaji
- 👤 Toshihiro Urano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:27
CPC Classifications
G; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
A method for magnetic recording comprising: recording a first magnetic latent image of a predetermined width on the surface of a recording medium with a recording head having the predetermined width at a first position, recording a second magnetic latent image on the surface of the recording medium to overlap only a portion of the first magnetic latent image on the surface of the recording medium with a recording head at a second position displaced from the first position to form a continuous narrowed first magnetic latent image on the surface of the recording medium having a width less than the predetermined width, rendering visible the portion of the first magnetic latent image not overlapped by the second magnetic latent image.
Claim 2
Independent Claim
121 words
A method for magnetic recording comprising: recording a first magnetic latent image of a predetermined width on the surface of a recording medium with a recording head having the predetermined width at a first position, recording a second magnetic latent image on the surface of the recording medium to overlap only a portion of the first magnetic latent image on the surface of the recording medium with a recording head at a second position displaced from the first position to form a continuous narrowed first magnetic latent image on the surface of the recording medium having a width less than the predetermined width, rendering visible the portion of the first magnetic latent image not overlapped by the second magnetic latent image.
Claim 3
Dependent Claim
39 words
A method for magnetic recording in accordance with claim 1 wherein the recording medium is a rotary magnetic drum and the second position is displaced from the first position along a line parallel to the axis of the drum.
Claim 4
Independent Claim
88 words
A method for magnetic recording comprising: recording a magnetic latent image of a predetermined width on the surface of a recording medium with a recording head having the predetermined width at a first position, erasing only a portion of the magnetic latent image on the surface of the recording medium with an erasing head at a second position displaced from the first position to form a narrowed magnetic latent image having a width less than the predetermined width, rendering visible the unerased portion of the magnetic latent image.
Claim 5
Independent Claim
88 words
A method for magnetic recording comprising: recording a magnetic latent image of a predetermined width on the surface of a recording medium with a recording head having the predetermined width at a first position, erasing only a portion of the magnetic latent image on the surface of the recording medium with an erasing head at a second position displaced from the first position to form a narrowed magnetic latent image having a width less than the predetermined width, rendering visible the unerased portion of the magnetic latent image.
Claim 6
Dependent Claim
39 words
A method for magnetic recording in accordance with claim 3 wherein the recording medium is a rotary magnetic drum and the second position is displaced from the first position along a line parallel to the axis of the drum.
Claim 7
Dependent Claim
113 words
Magnetic recording apparatus comprising: means at a first position for recording a first magnetic latent image of a predetermined width on the surface of a recording medium, means at a second position displaced from the first position for recording a second magnetic latent image on the surface of the recording medium to overlap only a portion of the first magnetic latent image on the surface of the recording medium to form a continuous narrowed first magnetic latent image on the surface of the recording medium having a width less than the predetermined width, means for rendering visible the portion of the first magnetic latent image not overlapped by the second magnetic latent image.
Claim 8
Dependent Claim
113 words
Magnetic recording apparatus comprising: means at a first position for recording a first magnetic latent image of a predetermined width on the surface of a recording medium, means at a second position displaced from the first position for recording a second magnetic latent image on the surface of the recording medium to overlap only a portion of the first magnetic latent image on the surface of the recording medium to form a continuous narrowed first magnetic latent image on the surface of the recording medium having a width less than the predetermined width, means for rendering visible the portion of the first magnetic latent image not overlapped by the second magnetic latent image.
Claim 9
Dependent Claim
37 words
Magnetic recording apparatus in accordance with claim 5 wherein the recording medium is a rotary magnetic drum and the second position is displaced from the first position along a line parallel to the axis of the drum.
Claim 10
Dependent Claim
80 words
Magnetic recording apparatus comprising: means at a first position for recording a magnetic latent image of a predetermined width on the surface of a recording medium, means at a second position displaced from the first position for erasing only a portion of the magnetic latent image on the surface of the recording medium to form a narrowed magnetic latent image having a width less than the predetermined width, means for rendering visible the unerased portion of the magnetic latent image.
Claim 11
Dependent Claim
80 words
Magnetic recording apparatus comprising: means at a first position for recording a magnetic latent image of a predetermined width on the surface of a recording medium, means at a second position displaced from the first position for erasing only a portion of the magnetic latent image on the surface of the recording medium to form a narrowed magnetic latent image having a width less than the predetermined width, means for rendering visible the unerased portion of the magnetic latent image.
Claim 12
Dependent Claim
37 words
Magnetic recording apparatus in accordance with claim 7 wherein the recording medium is a rotary magnetic drum and the second position is displaced from the first position along a line parallel to the axis of the drum.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |