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:
Jan. 21, 1992
Filed:
Aug. 13, 1990
Kevin C Veenstra, St. Paul, MN (US);
Jon R Clark, Minneapolis, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A disk cartridge including a rotatable disk, a cartridge case for housing the disk having upper and lower shells, and a cleaning wiper disposed between each surface of the disk and the respective upper and lower shells is disclosed. A lifter is mounted on the lower shell for biasing the wipers into contact with the disk. Ribs are mounted on the upper shell opposite the lifter. The ribs are substantially parallel to the disk radius and substantially perpendicular to the direction of rotation of the disk and extend for substantially the entire radius of the disk. The ribs maintain a minimum level of wiping pressure on the disk along the entire radius of the disk. 3:1.9.