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:
Oct. 12, 1999
Filed:
Feb. 02, 1998
Applicant:
Inventors:
Hiroshi Okuyama, Akita, JP;
Yutaka Saito, Akita, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; H01P / ; H01Q / ;
U.S. Cl.
CPC ...
252 6259 ; 252 6256 ; 252 6255 ; 252 / ; 252 / ; 342-1 ; 342-2 ; 342-4 ; 219736 ; 219744 ; 2505151 ; 2505181 ; 423594 ; 174 / ;
Abstract
A radio wave absorbent comprises an Ni--Cu--Zn base ferrite having a major composition comprising 49 to less than 50 mol % of Fe.sub.2 O.sub.3, 32 to 35 mol % of ZnO, 3 to 9 mol % of CuO and 9 to 14 mol % of NiO. The radio wave absorbent further contains an additive molybdenum oxide in an amount of greater than 0 to 0.10 wt %, calculated as MoO.sub.3, with the proviso that the total amount of the major composition is 100 wt %. The radio wave absorbent may be used as an exterior or interior material for a building or structure.