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:
Mar. 13, 1990
Filed:
Sep. 08, 1988
Yuuji Iwahashi, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
An erase prevention device for use in a recording medium casing to selectively inhibit recording on a recording medium contained in the recording medium casing when the casing is placed in a recorder. The device comprises coaxial holes formed in the recording medium casing to provide an injection passage. A slider is guided for sliding movement in the recording medium casing between first and second positions. The slider opens the inspection passage in the first position to inhibit recording and closes the inspection passage in the second position to allow recording. An aperture is formed in the recording medium casing for providing a visible indication of the position of the slider. The slider opens the aperture in the first position and closes the aperture in the second position. With this arrangement, the position of the slider is apparent at a glance to prevent mistake.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile