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. 12, 1985
Filed:
Jan. 24, 1983
Kazuharu Odawara, Yokohama, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A radiation-sensitive record disc having a first substrate and a second substrate, coaxially positioned and spaced from the first substrate. The second substrate has an inner vent hole perpendicular to its surface which provides fluid communication between the space and the outer surface to the substrate. A pressure equilibrium housing is coaxially provided on the outer surface of the second substrate in communication with the vent hold. This housing has a recess on its inner surface adjacent the outer surface of the second substrate so as to form a cavity. An expansible membrane is provided in the cavity for receiving, through the vent hole, the internal pressure which exists in the air space. This cavity also contains an outer vent hole, on its outer surface, to provide equilibrium between the pressure within the air space and the surrounding air so as to absorb the change of intended pressure within the air space.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile