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:
Jun. 18, 2002
Filed:
Mar. 05, 2001
Hirotsugu Sakamoto, Chiba, JP;
Hiroshi Sasaki, Mobara, JP;
Kenichi Watanabe, Isumi, JP;
Shinichi Kato, Mobara, JP;
Other;
Abstract
A color display device includes a color cathode ray tube having a phosphor screen, a color selection electrode and an electron gun for projecting plural in-line electron beams toward the phosphor screen, a deflection device for deflecting the electron beams horizontally and vertically, an electron beam correction apparatus including a correction coil wound around the tube axis, a deflection circuit for driving the deflection device, and an electron beam correction circuit for supplying to the electron beam correction apparatus a generally rectangular-wave signal having a period equal to two times a period of the vertical deflection of the electron beams and in synchronism with the vertical deflection of the electron beams.