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:
Sep. 24, 1991
Filed:
Apr. 27, 1989
Applicant:
Inventor:
Lee J Jones, Dandridge, TN (US);
Assignee:
Ten-Tec, Inc., Sevierville, TN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ;
U.S. Cl.
CPC ...
333188 ; 333189 ;
Abstract
A crystal filter with continuously variable passband, and a constant input and output impedance using quartz crystals, fixed inductors and varactor diodes. The width of the filter passband is set by a DC voltage on a single control line through a resistor biasing network.