Patents by Inventor Phillip A. McCollum

Phillip A. McCollum 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).

  • Apparatus for absorbing shocks to the ink supply of an ink jet printer
    Patent number: 4347524
    Abstract: A piezoelectrically driven ink jet printer includes a shock absorbing mechanism positioned in the ink supply tube for minimizing the effects on the ink within the print head of physical shocks to the ink supply tube or ink supply cartridge. The shock absorbing mechanism includes a flow restriction device and a reservoir device arranged such that the physical performance of the shock absorbing mechanism is analogous to the electrical performance of an RC low pass filter.
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: August 31, 1982
    Assignee: Hewlett-Packard Company
    Inventors: Pedro F. Engel, Phillip A. McCollum