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.:
Date of Patent:
Sep. 19, 1989
Filed:
Oct. 31, 1988
Applicant:
Inventor:
Yoshitake Kato, Ibaragi, JP;
Assignee:
Hitachi Maxell, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360133 ;
Abstract
In a recording disc assembly comprising a recording disc, a hub made of plastic resin material, having a pair of reference surfaces formed on the inner surface of a rotational shaft insertion hole for positioning the disc assembly in a recording device by engagement of a rotational shaft of the recording device and a supporting plate made of metal integrally formed with the hub, the supporting plate is provided with at least a stepped portion near the reference surfaces so as to assure good accuracy of the flat plane of the reference surfaces when the hub is molded.