Patent US4945438A successfully refreshed from Google Patents.
US4945438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined magnetic head
Assignee: Fujifilm Holdings Corp
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Filing: 1988-04-25
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Granted: 1990-07-31
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Expires: 2008-04-25
Abstract
Abstract A combined magnetic head for recording a data track on a guard band between main tracks of a floppy disk. A guard band data head for data tracks is positioned above the guard band and has a width so as to record satisfactorily data on the guard band without degrading recorded information on the main tracks irrespective of whether the recording is performed with the data head stretching over the main tracks. The width is preferably between 40% and 60% of the guard band.
Inventors
- 👤 Takashi Matsumoto
- 👤 Taichi Takesa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/488; G11B5/4886; G11B5/012; G11B5/016
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
A combined magnetic head comprising: two main heads for forming main tracks on a recording medium, said main heads being separated from each other in a width direction of said main tracks of said recording medium by a predetermined distance; and a data head fixed to said main heads and having a width in said width direction of between 2/5 to 3/5 of said predetermined distance.
Claim 2
Dependent Claim
66 words
A combined magnetic head comprising: two main heads for forming main tracks on a recording medium, said main heads being separated from each other in a width direction of said main tracks of said recording medium by a predetermined distance; and a data head fixed to said main heads and having a width in said width direction of between 2/5 to 3/5 of said predetermined distance.
Claim 3
Dependent Claim
18 words
A combined magnetic head as recited in claim 1, wherein said data head is positioned within said interval.
Claim 4
Dependent Claim
23 words
A combined magnetic head as claimed in claim 1, wherein said data head has an azimuth angle with respect to said main heads.
Claim 5
Dependent Claim
17 words
A combined magnetic head as claimed in claim 3, wherein said azimuth angle is 10° to 40°.
Claim 6
Dependent Claim
106 words
A combined magnetic head, comprising: two main heads for forming main tracks on a recording medium, said main heads being separated by a predetermined distance and formed in a line in a track-width direction of said recording medium moving with respect to said combined magnetic head; and a data head having a width smaller than that of said predetermined distance between said two main heads, wherein said data head is closer to one of said two main heads than to the other of said two main heads, and wherein said data head is positioned at a non-zero azimuth angle with respect to said two main heads.
Claim 7
Dependent Claim
106 words
A combined magnetic head, comprising: two main heads for forming main tracks on a recording medium, said main heads being separated by a predetermined distance and formed in a line in a track-width direction of said recording medium moving with respect to said combined magnetic head; and a data head having a width smaller than that of said predetermined distance between said two main heads, wherein said data head is closer to one of said two main heads than to the other of said two main heads, and wherein said data head is positioned at a non-zero azimuth angle with respect to said two main heads.
Claim 8
Dependent Claim
17 words
A combined magnetic head as recited in claim 5, wherein said azimuth angle is 10° to 40°.
References Cited (Backward Citations)
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JPS58194106A
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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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |