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. 01, 1991
Filed:
Jul. 17, 1989
Yasushi Kikuchi, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Minami-ashigari, JP;
Abstract
Disclosed is a process for producing an information recording medium of air-sandwich type for optically recording or reproducing information which comprises an information recording disc and hubs provided on both sides at the center thereof. In the process, using a receiving tool provided with a disc-shaped raised portion for receiving a substrate at its center and a hub-receiving center axis extended upward from the center, a circular hole of the disc is fitted to the raised portion of the receiving tool, then a magnetizable hub having a magnetizable substance and a clamping hole at the center is fitted coaxially to the recording disc, and the hub is joined to the disc. Thereafter, the disc joined with the hub is turned over and fitted onto other receiving tool, and the other hub is joined to the disc. Otherwise, after one hub is joined to the recording disc on one side, another magnetizable hub may be joined to the back side of the recording disc by fitting the magnetizable hub to a different receiving tool and then fitting the above-obtained disc onto the magnetizable hub.