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:
Jul. 21, 1992
Filed:
Nov. 30, 1988
Tetsuo Hosokawa, Numazu, JP;
Yutaka Ueda, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An information recording medium of an air-sandwich sealed type is disclosed, which comprises a pair of disk-shaped substrate to form an inner space therebetween; an inner circumferential spacer and an outer circumferential spacer interposed between the pair of disk-shaped substrates; and a recording layer formed on the inner surface of at least one of the disk-shaped substrates, with an adhesive agent being applied to the surface of at least the inner circumferential spacer or the outer circumferential spacer in the form of a plurality of concentric adhesive layers, each of the concentric adhesive layers having at least one cut-away portion to which the adhesive agent is not applied to form a vent and an air passage between the surface of the inner circumferential space or the outer circumferential spacer and any of the substrates, the vent and the air passage capable of allowing the air to pass from the inner inner space formed by the disk-shaped substrates to the outside and vice versa, and the cut-away portions of the adhesive layers being shifted in position from each other.