US4545500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape cassette
Assignee: Sony Corp
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Filing: 1983-12-12
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Granted: 1985-10-08
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Expires: 2003-12-12
Abstract
Abstract A tape cassette for holding a magnetic tape which is constituted by an upper half and a lower half which define a cassette case and a tape guide located therein, wherein at least one of the upper half, the lower half and the tape guide is made of material containing ceramics.
Inventors
- 👤 Tokundo Yamaguchi
- 👤 Masanori Kimizuka
- 👤 Isao Kawashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:04
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08785; G11B23/08757
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
A tape cassette for holding a magnetic tape inside thereof comprising: a first member forming an upper half; a second member forming a lower half cooperating with said first member to define a case having an enclosed space for accommodating said magnetic tape; a plurality of openings formed in a front of wall portion of said case; and a third member that integrally includes a plurality of tape guide members for guiding said tape, arranged in said case and positioned near said openings, a fixed pin secured to one of said first or second members and interconnected to said third member, both side surfaces of said third member contacting respective concave surface portions formed on said first and second members whereby the position of said third member in vertical direction is restricted by the inside surfaces of said first and second members; said third member being formed of synthetic resin and ceramic power.
Claim 2
Dependent Claim
153 words
A tape cassette for holding a magnetic tape inside thereof comprising: a first member forming an upper half; a second member forming a lower half cooperating with said first member to define a case having an enclosed space for accommodating said magnetic tape; a plurality of openings formed in a front of wall portion of said case; and a third member that integrally includes a plurality of tape guide members for guiding said tape, arranged in said case and positioned near said openings, a fixed pin secured to one of said first or second members and interconnected to said third member, both side surfaces of said third member contacting respective concave surface portions formed on said first and second members whereby the position of said third member in vertical direction is restricted by the inside surfaces of said first and second members; said third member being formed of synthetic resin and ceramic power.
Claim 3
Dependent Claim
40 words
A tape cassette according to claim 1, wherein said ceramic powder is made of at least one of materials selected from the group consisting of SiC, Si 3 N 4 , BN, TiN, WC and Al 2 O 3 .
Claim 4
Dependent Claim
29 words
A tape cassette according to claim 1, wherein asaid synthetic resin is made of at least one of materials selected from the group consisting of polyamide, polyester and polyolefin.
Claim 5
Dependent Claim
30 words
A tape cassette according to claim 1 wherein said material making said third member contains said ceramic powder at volume ratio from 30% to 50% relative to said synthetic resin.
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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |