Patents by Inventor Mark D. Pfeiffer

Mark D. Pfeiffer 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).

  • O-ring pick
    Patent number: D1123547
    Type: Grant
    Filed: July 17, 2024
    Date of Patent: April 28, 2026
    Assignee: Caterpillar Inc.
    Inventors: Michael Scott Hemry, Joseph Jeffery Every, Nathaniel Steven Lee Phillips, Gregory J. Parsons, Mark D. Pfeiffer
  • O-ring pick
    Patent number: D1138593
    Type: Grant
    Filed: July 17, 2024
    Date of Patent: August 4, 2026
    Assignee: Caterpillar Inc.
    Inventors: Joseph Jeffery Every, Nathaniel Steven Lee Phillips, Gregory J. Parsons, Mark D. Pfeiffer