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US4655348A
Expired / Lapsed
US
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Magnetic recording disc-jacket assembly
Assignee: Mitsubishi Chemical Corp
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Filing: 1984-11-14
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Granted: 1987-04-07
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Expires: 2004-11-14
Abstract
Abstract A magnetic recording disc-jacket assembly within which a magnetic recording disc is positioned includes a jacket having a central window for receiving a drive shaft and an elongated head window for receiving a recording/reproducing head. A cleaning liner made of fibrous material is disposed at each side of the disc within said jacket and is bonded to the jacket at heat bonding portions. The fibrous material is heat pressed so as to have a reduced thickness adjacent the cut edges for the respective windows of the liner to prevent fraying of the fibrous material.
Inventors
- 👤 Kenji Takagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:56
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/50; G11B23/505; G11B23/02; G11B23/03; G11B23/033; G11B23/0332
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
A magnetic recording disc-jacket assembly comprising: (a) a magnetic recording disc; (b) a jacket for rotatable accommodation of the disc, the jacket being provided with a central window for receiving a drive shaft of a recording/reproducing apparatus and an elongated head window for receiving a recording/reproducing head of said apparatus; and (c) a cleaning liner made of fibrous material disposed at each side of the disc, said fibrous material being lined on the inner surface of the jacket and bonded thereto with scattered heat-bonding portions, said liner being provided with a central window and head window corresponding to the respective windows of the jacket, wherein the cleaning liner has heat-pressed portions along the entirety of cut edges for the respective windows of the liner to prevent fraying of the fibrous material, said heat pressed portions being bonded to said jacket only at said scattered heat bonding portions, whereby fraying of said liner is substantially prevented.
Claim 2
Dependent Claim
155 words
A magnetic recording disc-jacket assembly comprising: (a) a magnetic recording disc; (b) a jacket for rotatable accommodation of the disc, the jacket being provided with a central window for receiving a drive shaft of a recording/reproducing apparatus and an elongated head window for receiving a recording/reproducing head of said apparatus; and (c) a cleaning liner made of fibrous material disposed at each side of the disc, said fibrous material being lined on the inner surface of the jacket and bonded thereto with scattered heat-bonding portions, said liner being provided with a central window and head window corresponding to the respective windows of the jacket, wherein the cleaning liner has heat-pressed portions along the entirety of cut edges for the respective windows of the liner to prevent fraying of the fibrous material, said heat pressed portions being bonded to said jacket only at said scattered heat bonding portions, whereby fraying of said liner is substantially prevented.
Claim 3
Dependent Claim
17 words
The magnetic recording disc-jacket assembly according to claim 1, wherein the fibrous material is a non-woven fabric.
Claim 4
Dependent Claim
19 words
The magnetic recording disc-jacket assembly according to claim 1, wherein the jacket is made of a flexible sheet material.
Claim 5
Dependent Claim
22 words
The magnetic recording disc-jacket assembly according to claim 1, wherein the jacket is made of a pair of rigid plastic plate materials.
Claim 6
Dependent Claim
28 words
The assembly of claim 1, wherein a thickness of said fibrous material at said heat pressed portions is less than a thickness of the remainder of said material.
References Cited (Backward Citations)
US3758371A
Cited
US3817816A
Cited
US4304621A
Cited
US4217386A
Cited
US4294640A
Cited
US4391669A
Cited
US4392170A
Cited
US4419160A
Cited
US4400227A
Cited
US4469736A
Cited
US4479579A
Cited
US4473432A
Cited
US4586606A
Cited
US4586606B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |