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US3545077A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of making multiple-element magnetic head

Assignee: Nihon Victor KK
•
Filing: 1968-12-02
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Granted: 1970-12-08
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Expires: 1988-12-02
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Abstract

Abstract A multiple-element magnetic head comprising a plurality of magnetic head half-members arranged in face to face relation with each other at opposing end surfaces, with magnetic gaps being formed between them. Such magnetic head half-members are each made by holding non-magnetic members of substantially inverted U-shape each including a horizontal portion and oppositely disposed vertical portions between magnetic members identical in shape and configuration with said non-magnetic members, holding the assembly between substantially U-shaped cores including a horizontal portion and oppositely disposed vertical portions, cutting off said horizontal portions of said non-magnetic members and said magnetic members while leaving said oppositely disposed vertical portions, and grinding end surfaces of said oppositely disposed vertical portions of the non-magnetic members and magnetic members at which the horizontal portions have been cut off so that said end surfaces may be flush with end surfaces of the cores which are to be positioned in face to face relation with end surfaces of cores of the other magnetic head half-member.

Inventors

  • 👤 Toshi Suzuki
  • 👤 Tsutomu Nishijima

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 14:01
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/4906

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

US3064333A Cited
US3495325A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1973-12-07 1974-06-08 1974-12-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1977-12-07 1978-06-08 1978-12-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1981-12-07 1982-06-08 1982-12-08 $7700.00 Window Closed / Lapsed

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