Patents by Inventor David R. Prengaman

David R. Prengaman 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).

  • Patent number: 10637044
    Abstract: A process of preparing a continuous cast lead-based alloy strip for use in the manufacture of a battery grid of a lead-acid battery, the process comprising mechanically deforming, at a deformation temperature in a range of about 15 to about 150° C., a continuous cast lead-based alloy strip having a thickness of tcast that is in a range that is from about 0.6 to about 2 mm to reduce the thickness of the strip to a thickness of treduced that is in a range that is from about 0.4 to about 1.5 mm such that the reduction in thickness is in a range of about 10 to about 50%, wherein the lead-based alloy comprises lead and silver and is essentially free of calcium, and wherein the silver is at a concentration that is in a range of about 0.003 to about 0.015 weight percent.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: April 28, 2020
    Assignees: NORTHSTAR BATTERY COMPANY, LLC, RSR TECHNOLOGIES INC.
    Inventors: Frank A. Fleming, Timothy W. Ellis, David R. Prengaman
  • Publication number: 20180248171
    Abstract: A process of preparing a continuous cast lead-based alloy strip for use in the manufacture of a battery grid of a lead-acid battery, the process comprising mechanically deforming, at a deformation temperature in a range of about 15 to about 150° C., a continuous cast lead-based alloy strip having a thickness of tcast that is in a range that is from about 0.6 to about 2 mm to reduce the thickness of the strip to a thickness of treduced that is in a range that is from about 0.4 to about 1.5 mm such that the reduction in thickness is in a range of about 10 to about 50%, wherein the lead-based alloy comprises lead and silver and is essentially free of calcium, and wherein the silver is at a concentration that is in a range of about 0.003 to about 0.015 weight percent.
    Type: Application
    Filed: May 1, 2018
    Publication date: August 30, 2018
    Inventors: Frank A. Fleming, Timothy W. Ellis, David R. Prengaman
  • Patent number: 9985276
    Abstract: A battery grid comprising a continuous cast and mechanically deformed lead-based alloy that comprises lead and silver and is essentially free of calcium, wherein the silver is at a concentration that is in a range of about 0.003 to about 0.015 weight percent, and has a predominant equiaxed grain structure that comprises grain sizes that are in a range of about 0.1 to about 5 microns. Other alloy constituents include bismuth at a concentration that is in a range of about 0.003 to about 0.002 weight percent and tin at a concentration that is in a range of about 0.2 to about 1.8 weight percent. A process for making strip of said alloy for use in manufacturing said grid. A battery comprising said grid.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: May 29, 2018
    Assignees: NORTHSTAR BATTERY COMPANY, LLC, RSR TECHNOLOGIES INC.
    Inventors: Frank A Fleming, Timothy W Ellis, David R Prengaman
  • Publication number: 20150125748
    Abstract: A battery grid comprising a continuous cast and mechanically deformed lead-based alloy that comprises lead and silver and is essentially free of calcium, wherein the silver is at a concentration that is in a range of about 0.003 to about 0.015 weight percent, and has a predominant equiaxed grain structure that comprises grain sizes that are in a range of about 0.1 to about 5 microns. Other alloy constituents include bismuth at a concentration that is in a range of about 0.003 to about 0.002 weight percent and tin at a concentration that is in a range of about 0.2 to about 1.8 weight percent. A process for making strip of said alloy for use in manufacturing said grid. A battery comprising said grid.
    Type: Application
    Filed: November 5, 2014
    Publication date: May 7, 2015
    Inventors: Frank A. Fleming, Timothy W. Ellis, David R. Prengaman
  • Patent number: 7923155
    Abstract: A lead-acid battery grid made from a lead-based alloy containing, in addition to lead, tin at a concentration that is at least about 0.500%, silver at a concentration that is greater than 0.006%, and bismuth at a concentration that is at least about 0.005%, and, if calcium is present in the lead-based alloy, the calcium is at concentration that is no greater than about 0.010%.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: April 12, 2011
    Assignees: Northstar Battery Company, LLC, RSR Technologies
    Inventors: David R. Prengaman, Frank A. Fleming
  • Patent number: 7704452
    Abstract: A lead calcium tin alloy to which cobalt has been added is described. The alloy is useful in the formation of anodes to be used in electrowinning cells. Electrowinning cells containing the cobalt alloys are particularly suited for electrowinning metals, such as copper, from sulfuric acid electrolytes. The cobalt-containing anodes improve the efficiency of oxygen evolution at the anode during electrowinning and reduce corrosion of the anode.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: April 27, 2010
    Assignee: RSR Technologies, Inc.
    Inventors: David R. Prengaman, Andreas Siegmund
  • Publication number: 20080233482
    Abstract: A lead-acid battery grid made from a lead-based alloy containing, in addition to lead, tin at a concentration that is at least about 0.500%, silver at a concentration that is greater than 0.006%, and bismuth at a concentration that is at least about 0.005%, and, if calcium is present in the lead-based alloy, the calcium is at concentration that is no greater than about 0.010%.
    Type: Application
    Filed: March 17, 2008
    Publication date: September 25, 2008
    Applicants: NorthStar Battery Company LLC, RSR Technologies
    Inventors: David R. Prengaman, Frank Fleming