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. 11, 1977
Filed:
Oct. 08, 1975
Vern Schwartz, Sunnyvale, CA (US);
Information Terminals Corporation, Sunnyvale, CA (US);
Abstract
In a system of the type wherein a floppy magnetic disc enclosed in an envelope stores data on both sides, unless great care is taken in inserting the floppy disc into the using apparatus, which reads from or writes thereon, one can accidentally or erroneously erase or write over data. This invention provides a floppy disc with a hole which can align with one or the other of a pair of two holes through an envelope in which said disc rotates. An opaque moveable means can be positioned to block one or the other of these pair of holes. A photocell will produce enabling signals by sensing light passing through only one of the pair of holes when the floppy disc is positioned one way in the using apparatus and through the other of the pair of holes when the floppy disc is positioned another way in the using apparatus. Accordingly, only when the floppy disc is correctly positioned in the using apparatus can the transducer head be enabled to write or read.