Patents by Inventor David B. Crook

David B. Crook 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).

  • Remediation Of Polychlorinated Biphenyls In Retired Natural Gas Distribution Systems
    Publication number: 20120283501
    Abstract: Retired natural gas pipeline portions are filled with polyurethane foam compositions sealing therewithin any polychlorinated biphenyls (PCBs) that may be present in the retired pipeline portion.
    Type: Application
    Filed: July 17, 2012
    Publication date: November 8, 2012
    Inventor: David B. Crook
  • TREE PROTECTOR
    Publication number: 20120151836
    Abstract: A tree guard having an adjustable circumference is made up of a plurality of adjacent arcuate panels having opposite longitudinal edge portions adapted to receive fastener assemblies that connect the adjacent arcuate panels to one another. Each arcuate panel has an upstanding or upper portion that is positioned next to the tree trunk and a unitary, outwardly flared skirt portion that depends downwardly from the upper portion.
    Type: Application
    Filed: December 16, 2011
    Publication date: June 21, 2012
    Inventor: David B. Crook
  • Remediation of polychlorinated biphenyls in retired natural gas distribution systems
    Publication number: 20110021860
    Abstract: Retired natural gas pipeline portions are filled with polyurethane foam compositions sealing therewithin any polychlorinated biphenyls (PCBs) that may be present in the retired pipeline portion.
    Type: Application
    Filed: October 28, 2009
    Publication date: January 27, 2011
    Inventor: David B. Crook