Patent US4254864A successfully refreshed from Google Patents.
US4254864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective jacket for plane magnetic recording medium
Assignee: TDK Corp
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Filing: 1979-03-13
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Granted: 1981-03-10
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Expires: 1999-03-13
Abstract
Abstract A protective jacket for rotatably holding a plane disc magnetic recording medium between buffer sheets bonded on the inner surfaces of a body of the protective jacket in vortex or annular form around a rotary axis of the plane disc magnetic recording medium.
Inventors
- 👤 Chiho Mikura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:16
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/032
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A protective jacket for rotatably holding therein for rotation about an axis, a plane disc recording medium, said jacket including at least one buffer sheet bonded on the inner surfaces of said jacket, said at least one sheet contacting both planar surfaces of said disc, wherein said at least one buffer sheet is bonded to said jacket by a bond in the form of a plurality of gaps formed in said at least one buffer sheet forming concentric circles about said axis.
Claim 2
Dependent Claim
82 words
A protective jacket for rotatably holding therein for rotation about an axis, a plane disc recording medium, said jacket including at least one buffer sheet bonded on the inner surfaces of said jacket, said at least one sheet contacting both planar surfaces of said disc, wherein said at least one buffer sheet is bonded to said jacket by a bond in the form of a plurality of gaps formed in said at least one buffer sheet forming concentric circles about said axis.
Claim 3
Dependent Claim
80 words
A protective jacket for rotatably holding therein for rotation about an axis, a plane disc recording medium, said jacket including at least one buffer sheet bonded on the inner surfaces of said jacket, said at least one sheet contacting both planar surfaces of said disc, wherein said at least one buffer sheet is bonded to said jacket by a bond in the form of a gap formed in said at least one buffer sheet forming a vortex about said axis.
Claim 4
Dependent Claim
80 words
A protective jacket for rotatably holding therein for rotation about an axis, a plane disc recording medium, said jacket including at least one buffer sheet bonded on the inner surfaces of said jacket, said at least one sheet contacting both planar surfaces of said disc, wherein said at least one buffer sheet is bonded to said jacket by a bond in the form of a gap formed in said at least one buffer sheet forming a vortex about said axis.
Claim 5
Dependent Claim
34 words
The protective jacket of claim 1 or 2 wherein said at least one buffer sheet comprises two buffer sheet portions, each of said two buffer sheet portions contacting one planar surface of said disc.
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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |