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:
Jun. 12, 1990
Filed:
Aug. 03, 1987
Applicant:
Inventors:
Yoshimi Maehara, Kyoto, JP;
Mitsuhiro Chikuwa, Muko, JP;
Assignee:
Hitachi Maxell, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
242199 ; 242 718 ;
Abstract
In a tape reel for use in a recording tape cartridge for winding a recording tape, there are formed a plurality of radial grooves on the upper face of a lower flange of the tape reel and projected ribs on the lower face corresponding to the grooves so that the wall thickness of the lower flange can be generally equal over the entire area to improve the flow of the plastic resin material during the molding process and to exhaust unwanted air.