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:
Apr. 20, 1976
Filed:
Feb. 28, 1974
Atsushi Tomonaga, Tachikawa, JA;
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JA;
Toyo Boseki Kabushiki Kaisha, Osaka, JA;
Abstract
An electromagnetic wave absorbing material comprising as a conductive material hollow carbon microspheres which are prepared by the use of a coal-base or petroleum-base pitch material and which have a non-cohesive property with one another, and as a matrix a non-conductive material having a specific resistance of greater than 10.sup.3 .OMEGA. cm, the conductive material being mixed with the non-conductive material and the mixture being formed into moldings. The resultant composite moldings exhibit a satisfactory complex dielectric constant, so that the composite material is applicable, for example, as a waveguide microwave absorber, a microwave pollution preventive microwave absorber, a microwave absorber for microwave heating range, or a microwave absorber for an antenna.