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:
Dec. 13, 1988
Filed:
Sep. 11, 1987
Applicant:
Inventor:
Toshikazu Yoshino, Tokorozawa, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
430270 ; 430945 ; 428 65 ; 3461351 ; 346137 ; 369284 ; 369286 ; 369288 ;
Abstract
A disk-shaped information recording medium is provided in such a manner that at least one information bearing layer formed on a side of a pair of disk-shaped substrates, which substrates are arranged so that the information bearing layers face each other with a hollow space between them by means of inner and outer spacers being concentrically interposed between the two substrates. A polyurethane adhesive layer is formed between the substrate and the spacer to combine said pair of substrates together via the inner and outer spacers.