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. 13, 1981
Filed:
Nov. 16, 1979
Applicant:
Inventor:
John D Middleton, Welwyn, GB;
Assignee:
Marconi Instruments Limited, Chelmsford, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 / ; 324 / ; 340702 ; 340716 ;
Abstract
A spectrum analyser uses a monochrome cathode ray tube to display frequency information. A color swtich incorporating a layer of liquid crystal material and colored polarized dichroic plates is positioned in front of the display screen of the cathode ray tube and by operating the color switch in an appropriate manner a colored display is produced.