Patents by Inventor John W. Cretzmeyer

John W. Cretzmeyer 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).

  • Electrochemical cells with end-of-service indicator
    Patent number: 5180642
    Abstract: Non-aqueous cells employing an anode, such as lithium, a liquid organic electrolyte and a cathode comprising manganese dioxide (MnO.sub.2), carbon monofluoride (CF.sub.x) or mixtures of the two and an additive selected from the group consisting of vanadium oxide (V.sub.6 O.sub.13+y), silver vanadate (.beta.Ag.sub.x V.sub.2 O.sub.5, .delta.Ag.sub.x V.sub.2 O .sub.5 or Ag.sub.2 V.sub.4 O.sub.11), bismuth flouride (BiF.sub.3) and titanium sulfide (TiS.sub.2) as an end-of-service (EOS) indicator.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: January 19, 1993
    Assignee: Medtronic, Inc.
    Inventors: Douglas J. Weiss, John W. Cretzmeyer, Ann M. Crespi, William G. Howard, Paul M. Skarstad
  • Electrochemical cell with improved fill port
    Patent number: 5173375
    Abstract: One-piece electrochemical cell cover with improved seal area in the fill port. The fill port comprises a countersunk area and an integral boss formed directly underneath the countersunk area.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: December 22, 1992
    Assignee: Medtronic, Inc.
    Inventors: John W. Cretzmeyer, John C. Strohkirch
  • Electrolyte for lithium-manganese oxide cells and the like
    Patent number: 5154992
    Abstract: An improved electrolyte for electrochemical cells including as a cosolvent for the cell electrolyte salt an amount of diglyme; ethyl diglyme; ethyl glyme; triglyme, tetraglyme and higher glymes; dimethoxymethane; 1,2-dimethoxypropane; dimethoxy THF or mixtures thereof.
    Type: Grant
    Filed: August 10, 1990
    Date of Patent: October 13, 1992
    Assignee: Medtronic, Inc.
    Inventors: David R. Berberick, John W. Cretzmeyer, Donald R. Merritt, Paul M. Skarstad, Douglas J. Weiss
  • Metal/oxygen cells and method for optimizing the active life properties thereof
    Patent number: 4189526
    Abstract: Metal/oxygen cells such as zinc/air cells are provided with optimum active life characteristics by interposing, on the air side of the cell, an oxygen diffusivity-limiting membrane, such as, for example, sintered polytetrafluoroethylene, so that no more oxygen is received than is needed for the current rate required for the intended application.
    Type: Grant
    Filed: May 5, 1978
    Date of Patent: February 19, 1980
    Assignee: Gould Inc.
    Inventors: John W. Cretzmeyer, Hans R. Espig