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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 4188649 B1

PDFFull Text
Date of Patent:
Feb. 12, 1980

Filed:

Dec. 05, 1977

Magnetic head having a jagged-edged gap, and method for producing such

Applicant:
Inventors:

Samuel D Cheatham, Arvada, CO (US);

Neil L Robinson, Boulder, CO (US);

Edmond W Smathers, Boulder, CO (US);

Assignee:

IBM Corporation, Armonk, NY (US);

Attorneys:

O'Rourke; Thomas W.

Cockburn; Josh

Harris; Robert E.

Primary Examiner:

John H Wolff

Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360118 ; 360119 ;
Abstract

An AC magnetic erase head having improved AC erase characteristics, the magnetic head being formed of two half core elements of a magnetic material, preferably ferrite, defining an irregular edged or jagged-edged gap, and including a non-magnetic substance, preferably glass, within the gap. The magnetic head is preferably produced by thermally etching ferrite magnetic material forming the half core elements by means of relatively prolonged heat soak at an elevated temperature.

Find Patent Forward Citations

Cheatham, Samuel. (1980). Magnetic head having a jagged-edged gap, and method for producing such (U.S. Patent No. 4188649). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4188649

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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