Patents by Inventor Hershel R. Rabren

Hershel R. Rabren 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: 5457919
    Abstract: A sludge clarifier vessel bottom is disclosed which, in one embodiment, includes a bottom wall of the vessel and a portion of a steel side wall of the vessel, the walls intersecting at a corner, the bottom including the walls and a primer coat thereon, an amount of putty in the corner a resin base coat on the primer coat, fiberglass cloth on the resin base coat and a top resin coat on the fiberglass cloth. In one aspect crack controlling apparatus according to this invention is disposed beneath the plastic coat and the plastic coat is, preferably, not bonded to the crack controlling apparatus. Also disclosed are clarifiers with such bottoms.
    Type: Grant
    Filed: April 29, 1993
    Date of Patent: October 17, 1995
    Assignee: The Dow Chemical Company
    Inventors: Jeffrey H. Stultz, Hershel R. Rabren