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US4533968A Expired / Lapsed US ⏱️ 0.0 years remaining

Ceramic guides for tape-like materials and process for the production thereof

Assignee: Fujifilm Holdings Corp
•
Filing: 1982-09-29
•
Granted: 1985-08-06
•
Expires: 2002-09-29
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Abstract

Abstract A ceramic guide for tape-like materials such as magnetic recording tapes, movie films, and microfilms, and a process for producing such ceramic guides are described. The ceramic guide is a sintered product of (A) 98 to 93 parts by weight of barium titanate, (B) 2 to 7 parts by weight of a silicate inorganic binder, and (C) 0.2 to 2 parts by weight, per 100 parts by weight of (A) and (B), of lanthanum oxide. The ceramic guide meets the requirements for guides for use in, e.g., small sized video cassettes, is non-magnetic, electrically conductive and has anti-static properties and, therefore, it does not generate static charge and has a low coefficient of friction during running of tape-like materials in contact therewith.

Inventors

  • 👤 Tuneo Yoshida
  • 👤 Kengo Oishi
  • 👤 Motohiko Yagi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 06:35
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 53 words
A ceramic guide for tape-like materials, comprising a sintered molding of (A) 98 to 93 parts by weight of barium titanate, (B) 2 to 7 parts by weight of an inorganic silicate binder, and (C) 0.2 to 2 parts by weight, per 100 parts by weight of (A) and (B), of lanthanum oxide.
Claim 2
Dependent Claim 53 words
A ceramic guide for tape-like materials, comprising a sintered molding of (A) 98 to 93 parts by weight of barium titanate, (B) 2 to 7 parts by weight of an inorganic silicate binder, and (C) 0.2 to 2 parts by weight, per 100 parts by weight of (A) and (B), of lanthanum oxide.
Claim 3
Dependent Claim 33 words
The ceramic guide as claimed in claim 1, wherein at least the surface of the sintered molding which is used to contact with tape-like materials has been subjected to fine grinding and polishing.
Claim 4
Dependent Claim 67 words
A process for producing a ceramic guide for tape-like materials, which comprises molding a composition comprising (A) 98 to 93 parts by weight of barium titanate, (B) 2 to 7 parts by weight of an inorganic silicate binder, and (C) 0.2 to 2 parts by weight, per 100 parts by weight of (A) and (B) of lanthanum oxide, and sintering the resulting molding in a reducing atmosphere.
Claim 5
Dependent Claim 67 words
A process for producing a ceramic guide for tape-like materials, which comprises molding a composition comprising (A) 98 to 93 parts by weight of barium titanate, (B) 2 to 7 parts by weight of an inorganic silicate binder, and (C) 0.2 to 2 parts by weight, per 100 parts by weight of (A) and (B) of lanthanum oxide, and sintering the resulting molding in a reducing atmosphere.

References Cited (Backward Citations)

US3787229A Cited
US4062484A Cited
SU513386A1 Cited
US4378899A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-08-05 1989-02-04 1989-08-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-08-05 1993-02-04 1993-08-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-08-05 1997-02-04 1997-08-06 $7700.00 Window Closed / Lapsed

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