Patents by Inventor David L. Darby

David L. Darby 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: 4531266
    Abstract: A burial vault includes a lid and a box portion. Depending rests are attached to the exterior bottom face of the box portion, so as to permit easy transportation of the vault. In another preferred embodiment the vault lid has recesses on its exterior face, which correspond to and are engageable with these rests. In still another preferred embodiment, these rests are self-burying in the ground in order to firmly seat the vault during use.
    Type: Grant
    Filed: June 22, 1983
    Date of Patent: July 30, 1985
    Inventors: James W. Darby, David L. Darby
  • Patent number: 4314390
    Abstract: A composite burial vault is provided having a hollow liner constructed of a synthetic plastic material which is filled with concrete. In constructing the burial vault, a liquid bonding agent is applied against the liner. The bonding agent can be either an adhesive or a solvent which acts upon the plastic material or a combination of the adhesive and the solvent. Before the bonding agent dries, aggregate is applied to the surface of the liner preferably by a flocking gun. Alternatively, the bonding agent and aggregate can be simultaneously sprayed against the liner. As the bonding agent dries, the aggregate is bonded to the liner either by the adhesive and/or by a portion of the aggregate partially embedding in the liner. Concrete is then poured between a mold and the treated surface of the liner where it forms a mechanical bond to the coarse aggregate coating on the liner. Reinforcement strips are provided to strengthen the corner edges of the liner.
    Type: Grant
    Filed: August 11, 1980
    Date of Patent: February 9, 1982
    Inventors: James W. Darby, David L. Darby
  • Patent number: 4261083
    Abstract: A composite burial vault is provided having a hollow liner constructed of a synthetic plastic resinous material which is filled with concrete. In constructing the burial vault, the liner is constructed from thermosetting resinous material in any conventional method. While the liner is still wet, aggregate is applied to the surface of the liner by a flocking gun or the like. Concrete is then poured between a mold and the treated surface of the liner where it forms a mechanical bond to the coarse aggregate coating on the liner.
    Type: Grant
    Filed: February 22, 1977
    Date of Patent: April 14, 1981
    Inventors: David L. Darby, James W. Darby
  • Patent number: 4060581
    Abstract: A composite burial vault is provided having a hollow liner constructed of a synthetic plastic resinous material which is filled with concrete. In constructing the burial vault, the liner is constructed from thermosetting resinous material in any conventional method. While the liner is still wet, aggregate is applied to the surface of the liner by a flocking gun or the like. Concrete is then poured between a mold and the treated surface of the liner where it forms a mechanical bond to the coarse aggregate coating on the liner.
    Type: Grant
    Filed: November 8, 1974
    Date of Patent: November 29, 1977
    Inventors: David L. Darby, James W. Darby
  • Patent number: D265251
    Type: Grant
    Filed: July 24, 1980
    Date of Patent: June 29, 1982
    Inventors: James W. Darby, David L. Darby