Patents by Inventor Charles Willus

Charles Willus 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).

  • Determination of a maximum jetting frequency for an inkjet head
    Patent number: 9944070
    Abstract: Determination of a maximum jetting frequency for an inkjet head. The method includes generating a velocity/frequency curve for an inkjet head, and determining failure zones in the velocity/frequency curve that comprise frequencies in the velocity/frequency curve resulting in jetting failure of the inkjet head. The method further includes determining a range of maximum jetting frequencies of the inkjet head that are higher than the frequencies of the failure zones, wherein subharmonic frequencies of each of the maximum jetting frequencies are outside of the failure zones. The method further includes selecting the maximum jetting frequency for the inkjet head from the range of maximum jetting frequencies.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: April 17, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Stuart Howkins, Charles Willus