US4429823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape guide means for recording and/or reproducing apparatus and method of manufacturing the same
Assignee: Individual
•
Filing: 1981-12-28
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Granted: 1984-02-07
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Expires: 2001-12-28
Abstract
Abstract A tape guide pin for recording and/or reproducing apparatus includes a base body made of non-magnetic material and a surface layer formed on the base body, made of non-magnetic hard material, the surface layer having the surface roughness whose microscopic tips are rounded. A method of manufacturing the tape guide pin for recording and/or reproducing apparatus includes the steps of: forming a base body of non-magnetic material; forming a surface layer of non-magnetic hard material on the base body; subjecting the base body and/or the surface layer to surface treatment for dimensional accuracy of circumferential surface; and fine-finishing for rounding the microscopic tips of the surface roughness formed by the surface treatment for dimensional accuracy.
Inventors
- 👤 Yozaburo Umehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:16
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/605; G11B15/61
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
A tape cassette comprising a cassette case, a reel disposed therein, a tape fed from said reel and a cylindrical tape guide for guiding said tape; said cylindrical tape guide being provided with a surface layer formed by a hard chromium plating and comprising (a) a non-magnetic austenitic stainless steel upon which said hard chromium surface layer is formed, (b) a post extending from said cassette case, and (c) a projection extending from said post wherein said cylindrical tape guide includes a groove in at least one end thereof which is fitted to said projection.
Claim 2
Dependent Claim
95 words
A tape cassette comprising a cassette case, a reel disposed therein, a tape fed from said reel and a cylindrical tape guide for guiding said tape; said cylindrical tape guide being provided with a surface layer formed by a hard chromium plating and comprising (a) a non-magnetic austenitic stainless steel upon which said hard chromium surface layer is formed, (b) a post extending from said cassette case, and (c) a projection extending from said post wherein said cylindrical tape guide includes a groove in at least one end thereof which is fitted to said projection.
Claim 3
Dependent Claim
94 words
A tape cassette comprising a cassette case, a reel disposed therein, a tape fed from said reel and a cylindrical tape guide for guiding said tape; said cylindrical tape guide being provided with (a) a surface layer formed by a hard chromium plating, wherein said cylindrical tape guide further includes a slit formed in the axial direction thereof, (b) a post extending from said cassette case, and (c) a projection extending from said post wherein said cylindrical tape guide includes a groove in at least one end thereof which is fitted to said projection.
Claim 4
Dependent Claim
94 words
A tape cassette comprising a cassette case, a reel disposed therein, a tape fed from said reel and a cylindrical tape guide for guiding said tape; said cylindrical tape guide being provided with (a) a surface layer formed by a hard chromium plating, wherein said cylindrical tape guide further includes a slit formed in the axial direction thereof, (b) a post extending from said cassette case, and (c) a projection extending from said post wherein said cylindrical tape guide includes a groove in at least one end thereof which is fitted to said projection.
References Cited (Backward Citations)
US4168043A
Cited
US4313551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |