Patents by Inventor Robert L. Erickson

Robert L. Erickson 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).

  • Dental isolation dam
    Patent number: 5499917
    Abstract: A dental isolation dam has a plurality of elastic fibers arranged in a rectangular, crisscrossed pattern between impervious films. The fibers enable the dam to be easily placed, and, once released, clinch around necks of isolated teeth to provide enhanced moisture and infection control.
    Type: Grant
    Filed: December 14, 1994
    Date of Patent: March 19, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert L. Erickson, Paul E. Hansen, Paul A. Burgio, Joel D. Oxman, James D. Christoff
  • Printer
    Patent number: 3966035
    Abstract: A low cost dot printer head which includes a base plate of ferromagnetic material with slots that divide a rear portion of the plate into several magnetic circuits that are isolated from one another and that hold separate coils for individually magnetizing the circuits, the head also including an armature slideable along each magnetic circuit and a printer wire having a rear end fixed to a corresponding armature and a front end slideable in a guide mounted at the front of the base plate.
    Type: Grant
    Filed: March 1, 1974
    Date of Patent: June 29, 1976
    Inventor: Robert L. Erickson