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:
Jun. 14, 1988
Filed:
Aug. 31, 1987
Applicant:
Inventors:
Masaki Kamiya, Shimodate, JP;
Takao Sugawara, Shimodate, JP;
Kenji Tsukanishi, Shimodate, JP;
Yutaka Yamaguchi, Yuki, JP;
Mitsuo Yokota, Yuki, JP;
Masao Asaoka, Tsukuba, JP;
Assignee:
Hitachi Chemical Co. Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; B32B / ;
U.S. Cl.
CPC ...
4283171 ; 156 77 ; 264 451 ; 4283177 ; 4283179 ; 4283191 ; 428461 ;
Abstract
A substrate for high-frequency circuits best suited as a substrate for a flat antenna to receive satellite-broadcast microwaves or as a similar substrate, the substrate comprising (i) a porous insulator layer wherein the proportion by volume of open cells to all the cells is at least 50% and (ii) a metal foil laminated over at least one side of the insulator layer through (iii) a water-impermeable film, and a process for making such substrates.