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. 10, 2003
Filed:
May. 16, 2002
Applicant:
Inventor:
Yoshiaki Watanabe, Chiba, JP;
Assignee:
SII Printek Inc., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J 2/9393 ; B41J 2/938 ;
U.S. Cl.
CPC ...
B41J 2/9393 ; B41J 2/938 ;
Abstract
There are provided an ink jet head and an ink jet recording apparatus having a judging unit for making a judgment with ease on an ink filling state of a printing head without consuming any ink and recording medium that are used for verification. A controlling means controls a selection means to drive one of side walls adjacently disposed in ink passages provided on a head chip and obtains a piezoelectric signal generated on the other one of the side walls from a signal processing means , to thereby judge the ink filling state in the ink passage.