Patents by Inventor Darrel S. Nelson

Darrel S. Nelson 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).

  • Publication number: 20140054825
    Abstract: A composite formulation consisting of agglomerated industrial/residential sewer sludge and recycled high density polyethylene (HDPE) and/or polypropylene (PP) materials. The recycled plastic materials act as a binder for the pozzolan industrial/residential sewer sludge. The composite formulation can be produced in a batching process wherein the sieved dried sewer sludge and the recycled plastic in appropriate small cut pieces is fed into a large plastic extruder, heated and extruded into specific structures. The formulation can also be compounded using a compression mold wherein sieved dry sewer sludge are added to heated chopped recycled plastics and heat mixed to produce pellets or directed into a compression mold to create a structural member of predetermined shape.
    Type: Application
    Filed: October 29, 2013
    Publication date: February 27, 2014
    Inventors: Darrel S. Nelson, James M. Oliver
  • Patent number: 8568645
    Abstract: A composite formulation consisting of agglomerated industrial/residential sewer sludge and recycled high density polyethylene (HDPE) and/or polypropylene (PP) materials. The recycled plastic materials act as a binder for the pozzolan industrial/residential sewer sludge. The composite formulation can be produced in a batching process wherein the sieved dried sewer sludge and the recycled plastic in appropriate small cut pieces is fed into a large plastic extruder, heated and extruded into specific structures. The formulation can also be compounded using a compression mold wherein sieved dry sewer sludge are added to heated chopped recycled plastics and heat mixed to produce pellets or directed into a compression mold to create a structural member of predetermined shape.
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: October 29, 2013
    Inventors: Darrel S. Nelson, James M. Oliver
  • Publication number: 20120007284
    Abstract: A composite formulation consisting of agglomerated industrial/residential sewer sludge and recycled high density polyethylene (HDPE) and/or polypropylene (PP) materials. The recycled plastic materials act as a binder for the pozzolan industrial/residential sewer sludge. The composite formulation can be produced in a batching process wherein the sieved dried sewer sludge and the recycled plastic in appropriate small cut pieces is fed into a large plastic extruder, heated and extruded into specific structures. The formulation can also be compounded using a compression mold wherein sieved dry sewer sludge are added to heated chopped recycled plastics and heat mixed to produce pellets or directed into a compression mold to create a structural member of predetermined shape.
    Type: Application
    Filed: July 12, 2010
    Publication date: January 12, 2012
    Inventors: Darrel S. Nelson, James M. Oliver
  • Patent number: 5221828
    Abstract: A heated wiper blade has a conductive elastomer body and a pair of electrodes along each side of the body. The elastomer which has a resistivity in the range of 20-128 ohm-cm and a hardness of Shore A 64-70 comprises a rubber compound including carbon black in the range of 37-60 phr, a small amount of graphite in the range of 13 to 20 phr and a low concentration of plasticizer oil in the range 20-40 phr.
    Type: Grant
    Filed: July 16, 1992
    Date of Patent: June 22, 1993
    Assignee: General Motors Corporation
    Inventors: Rafil A. Basheer, Ismat A. Abu-Isa, Darrel S. Nelson
  • Patent number: 4662969
    Abstract: A method of forming perforations in polymer film includes the steps of forming a conductive film pattern on the film preferably in a bow tie shape using a material with a moderate resistivity and applying a microwave field across the film for a few seconds whereupon sufficient electrical energy is dissipated in the conductive spot to perforate the polymer. This method is operative even when the polymer film is laminated between layers of other dielectric material prior to the microwave processing.
    Type: Grant
    Filed: January 14, 1985
    Date of Patent: May 5, 1987
    Assignee: General Motors Corporation
    Inventors: Chen-Shih Wang, Darrel S. Nelson
  • Patent number: 4626642
    Abstract: A method of rapidly curing a thermoset polymer by blending and dispersing a quantity of electrically conductive fibers into the polymer and subjecting it to microwave radiation.
    Type: Grant
    Filed: October 8, 1985
    Date of Patent: December 2, 1986
    Assignee: General Motors Corporation
    Inventors: Chen-Shih Wang, Darrel S. Nelson
  • Patent number: 4420585
    Abstract: A method of mixing crosslinkable elastomeric polymers and reinforcing fillers has been developed that yields significant improvements in physical properties compared to like polymers mixed by conventional methods. The method entails working a filler-polymer mixture at a temperature between the glass transition temperature and the liquid-liquid temperature of the uncrosslinked polymer to enhance filler integration. The mixture is then heated to a temperature greater than the flow temperature of the uncrosslinked polymer and worked so that air bubbles dispersed in the mixture are eliminated. The heating and cooling steps are repeated until the filler particles are thoroughly integrated and substantially all air bubbles are eliminated.
    Type: Grant
    Filed: August 30, 1982
    Date of Patent: December 13, 1983
    Assignee: General Motors Corporation
    Inventors: Michael C. H. Lee, Darrel S. Nelson