Patents by Inventor John D. Powers

John D. Powers 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).

  • Level-indicating scope mount
    Patent number: 9015982
    Abstract: A fixture structured to attach a scope to a rifle. The fixture includes a level-vial that is visible by a shooter who is substantially at a conventional horizontal shooting position. In such position, the bubble element of the level-vial is disposed below the scope, and at a location that is intersected by a vertical plane containing the centerline of the rifle barrel.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: April 28, 2015
    Inventor: John D. Powers
  • Controlled roughening of reinforced cation exchange membrane
    Patent number: 5252193
    Abstract: A reinforced fluorinated cation exchange membrane for the electrolysis of alkali halide solutions is reinforced with fabric containing both sacrificial and permanent fibers in which the anolyte surface of the membrane is abraded to expose some of the reinforcement crossover points. A process for abrading the membrane and an electrolytic cell using the membrane are also claimed. The preferred method of abrasion is continuous sanding. The abraded membrane improves the current efficiency of the electrolytic cell.
    Type: Grant
    Filed: November 4, 1991
    Date of Patent: October 12, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John D. Powers