Patent US4748529A successfully refreshed from Google Patents.
US4748529A
Expired / Lapsed
US
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Magnetic tape cassette with anti-friction tape guides
Assignee: TDK Corp
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Filing: 1986-05-13
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Granted: 1988-05-31
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Expires: 2006-05-13
Abstract
Abstract A magnetic tape cassette including a lower housing section and an upper housing section assembled into a housing, a pair of reels held in the housing and carrying a length of magnetic tape wound thereon, and at least one magnetic tape guide wall provided at the front of the housing, characterized in that said at least one magnetic tape guide wall is formed in one piece with said lower housing section in such a relation that the magnetic tape guiding surface is substantially perpendicular to the outer bottom surface of said lower housing section and that said guiding surface is a matt surface.
Inventors
- 👤 Haruo Shiba
- 👤 Kimio Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:53
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757; G11B23/08785
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A magnetic tape cassette including a lower housing section and an upper housing section assembled into a housing, a pair of reels held in the housing and carrying a length of magnetic tape wound thereon, and at least one magnetic tape guide wall provided at the front of the housing, said at least one magnetic tape guide wall being formed in one piece with said lower housing section in such a relation that the magnetic tape guiding surface is substantially perpendicular to the outer bottom surface of said lower housing section and that said guiding surface is a matt surface having a surface roughness between 10 μm RZ and 30 μm RZ, whereby electrostatic sticking, scraping, deformation and stoppage of the tape is reduced.
Claim 2
Dependent Claim
124 words
A magnetic tape cassette including a lower housing section and an upper housing section assembled into a housing, a pair of reels held in the housing and carrying a length of magnetic tape wound thereon, and at least one magnetic tape guide wall provided at the front of the housing, said at least one magnetic tape guide wall being formed in one piece with said lower housing section in such a relation that the magnetic tape guiding surface is substantially perpendicular to the outer bottom surface of said lower housing section and that said guiding surface is a matt surface having a surface roughness between 10 μm RZ and 30 μm RZ, whereby electrostatic sticking, scraping, deformation and stoppage of the tape is reduced.
References Cited (Backward Citations)
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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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |