Patents by Inventor Chris T. Armijo

Chris T. Armijo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6352331
    Abstract: A nozzle detection test pattern has been developed which can be sensed by an optical sensor located on an inkjet printer carriage. By having the same nozzle print ink drops on multiple pixels to form a single thickened test line during multiple passes of the printhead, it is possible to thereafter scan across such test line and automatically determine by the light contrast ratios which nozzles are not firing properly. A green light LED is used to illuminate the magenta, cyan and black test patterns as they are being sensed, and a blue light LED is used to illuminate the yellow test pattern as it is being sensed. A separate test pattern is used for each printhead ink color. The test pattern constitutes six rows with forty test lines on each row for a printhead having 240 active nozzles.
    Type: Grant
    Filed: March 4, 1997
    Date of Patent: March 5, 2002
    Assignee: Hewlett-Packard Company
    Inventors: Chris T. Armijo, Gonzalo Gaston, Javier Lagares, Antoni Gil, Francesc Subirada, Francisco Guerrero