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:
Nov. 07, 2006
Filed:
Aug. 02, 2005
Applicants:
Haruo Kawakita, Okazaki, JP;
Koji Ando, Kariya, JP;
Inventors:
Haruo Kawakita, Okazaki, JP;
Koji Ando, Kariya, JP;
Assignee:
DENSO Corporation, Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02P 3/055 (2006.01);
U.S. Cl.
CPC ...
Abstract
An ignition system for an internal combustion engine is connected to an ignition coil and to a circuit for providing an ignition signal. The ignition system includes a switch circuit connected to the ignition coil that switches on or off current supplied to the ignition coil, a control circuit that controls the switch circuit based on the ignition signal and a protection circuit that includes a pair of back-to-back connected zener diodes connected between the input terminal of the control circuit and a ground.