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:
Dec. 05, 1989
Filed:
Apr. 19, 1989
Applicant:
Inventor:
Yoshitake Kato, Ibaraki, JP;
Assignee:
Hitachi Maxell, Ltd., Ibaraki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360133 ; 360135 ; 369290 ;
Abstract
A disk cartridge comprises a case and a disk encased in the case, the disk having a hub comprising a flange of thin metal sheet and a control ring integrated with the flange by outsert molding the control ring from a compound plastic containing 5 to 40% by weight of a filler, and a dimensional ratio of flange plate thickness to control ring inner diameter being 1/50 to 1/30. The hub has a higher plane precision, a higher attrition resistance, and a higher heat resistance.