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:
Apr. 10, 1990
Filed:
Jun. 20, 1988
Kiyoshi Urayama, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magnetic tape cassette comprising a tape reel having a lower flange with an annular guide projection on a bottom surface thereof and a cassette casing including a lower housing portion with an annular guide portion on the inner surface thereof for limiting play of the tape reel within the cassette casing in any directions of the tape reel assemblies. Dust is generated only at a contacting section between surfaces of the annular projection and the annular recess portion. The dust, therefore, tends to fall out of circular openings of the lower housing portion, and since the edges of the flanges are prevented from coming into contact with the interior surface of the casing, no dust is formed within the cavity in which the tape is disposed; thus damage to the tape is avoided.