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:
Aug. 29, 1989
Filed:
Nov. 17, 1988
Applicant:
Inventor:
Takashi Funada, Yokosuka, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ; H03H / ;
U.S. Cl.
CPC ...
330304 ; 330126 ; 330306 ; 333 / ;
Abstract
A variable equalization system is disclosed, in which a plurality of amplification cells having a plurality of filter groups with natural frequencies progressively increased four times are connected in series or in parallel, thereby making possible a variable equalization over a wide range of cable length.