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. 11, 2008
Filed:
Sep. 29, 2006
James J. Haflinger, San Diego, CA (US);
James J. Haflinger, San Diego, CA (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A method and apparatus for determining defective heating resistors Rin each of a plurality of inkjets in an inkjet printer, wherein each heating resistor Ris connected in parallel with a common capacitor, the method for each heating resistor Rincludes providing a variable power supply effective in a first condition to produce a first operating DC voltage and, in a second condition, to produce a second known test DC voltage V, and inserting a known reference resistor Rin series with the heating resistor Rand capacitor and also open circuiting the capacitor in response to sensing that the power supply has changed from the first condition to the second condition. The method and apparatus further include digitizing the voltage Vat the electrical junction between the heating resistor Rand the reference resistor R, and using the digitized voltage to determine if the heating resistor Ris defective.