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:
Jul. 08, 1980
Filed:
Aug. 16, 1977
Takeshi Murakami, Yokohama, JP;
Katashi Hazama, Yokohama, JP;
Hitachi, Ltd., , JP;
Abstract
It has been known that a sound trap or band pass amplifier makes the group delay characteristic of a chromaticity signal component non-uniform. The present invention provides an elastic surface wave filter whose amplitude characteristic is so determined as to be adapted for a video intermediate frequency amplifier and whose group delay characteristic is so determined that the chromaticity signal component in a color composite video signal from a tuner advances further in delay time on the high frequency side than on the low frequency side in order to compensate that non-uniformity of the group delay characteristic from which the chromaticity signal component suffers.