Patents by Inventor Petra Merkel

Petra Merkel 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).

  • Zinc powder or zinc alloy powder for alkaline batteries
    Patent number: 7524582
    Abstract: The invention is directed to a zinc powder or zinc alloy powder for alkaline batteries, which powder has a grain size distribution wherein 60 to 100 wt.-% of the particles, relative to the zinc powder or zinc alloy powder, have a diameter of from 40 to 140 ?m. The invention is also directed to an alkaline battery.
    Type: Grant
    Filed: June 5, 2006
    Date of Patent: April 28, 2009
    Assignee: Grillo-Werke AG
    Inventors: Armin Melzer, Petra Merkel, Jochen Spiestersbach, Rudi Kube, Norbert Schulz
  • Zinc powder or zinc alloy powder with inhomogeneous bulk density for alkaline batteries
    Patent number: 7323031
    Abstract: The invention relates to zinc powders or zinc alloy powders with an inhomogeneous bulk density distribution depending on the particle size, wherein the difference of the bulk density measured according to ASTM B212 in the particle size range smaller than 75 ?m and that in the particle size range greater than 150 ?m is at least 0.5 g/cm3, and the mean bulk density of the powder, measured according to ASTM B212, ranges from 1.8 to 4.0 g/cm3. The invention is also directed to mixtures of said zinc powders or zinc alloy powders and to an alkaline battery including said powders.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: January 29, 2008
    Assignee: Grillo-Werke AG
    Inventors: Armin Melzer, Petra Merkel, Jochen Spriestersbach, Rudi Kube, Norbert Schulz
  • ZINC POWDER OR ZINC ALLOY POWDER FOR ALKALINE BATTERIES
    Publication number: 20060210878
    Abstract: The invention is directed to a zinc powder or zinc alloy powder for alkaline batteries, which powder has a grain size distribution wherein 60 to 100 wt.-% of the particles, relative to the zinc powder or zinc alloy powder, have a diameter of from 40 to 140 ?m. The invention is also directed to an alkaline battery.
    Type: Application
    Filed: June 5, 2006
    Publication date: September 21, 2006
    Inventors: Armin Melzer, Petra Merkel, Jochen Spiestersbach, Rudi Kube, Norbert Schulz
  • Zinc powder or zinc alloy powder with inhomogeneous bulk density for alkaline batteries
    Publication number: 20040187640
    Abstract: The invention relates to zinc powders or zinc alloy powders with an inhomogeneous bulk density distribution depending on the particle size, wherein the difference of the bulk density measured according to ASTM B212 in the particle size range smaller than 75 &mgr;m and that in the particle size range greater than 150 &mgr;m is at least 0.5 g/cm3, and the mean bulk density of the powder, measured according to ASTM B212, ranges from 1.8 to 4.0 g/cm3. The invention is also directed to mixtures of said zinc powders or zinc alloy powders and to an alkaline battery including said powders.
    Type: Application
    Filed: January 9, 2004
    Publication date: September 30, 2004
    Inventors: Armin Melzer, Petra Merkel, Jochen Spriestersbach, Rudi Kube, Norbert Schulz
  • Zinc powder or zinc alloy powder for alkaline batteries
    Publication number: 20030203281
    Abstract: The invention is directed to a zinc powder or zinc alloy powder for alkaline batteries, which powder has a grain size distribution wherein 60 to 100 wt.-% of the particles, relative to the zinc powder or zinc alloy powder, have a diameter of from 40 to 140 &mgr;m. The invention is also directed to an alkaline battery.
    Type: Application
    Filed: January 9, 2003
    Publication date: October 30, 2003
    Inventors: Armin Melzer, Petra Merkel, Jochen Spriestersbach, Rudi Kube, Norbert Schulz