Patents by Inventor Robert E. Bald

Robert E. Bald 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).

  • Corrosion protective band for underground pipe joints with metal parts
    Patent number: RE29394
    Abstract: A system of protecting pipes with bell and spigot joints (having metal parts) from corrosion .[.be.]. .Iadd.by .Iaddend.fitting between the spigot and bell at least one dry band of open celled material (preferably reticulated polyurethane foam) having a hydratable cement (preferably Portland cement) impregnated therein and engaging the band between the bell and the spigot. On wetting of the band, the cement is hydrated to form a water impervious hard sealant in the joint which releases alkalinity to protect the metal.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: September 13, 1977
    Assignee: Interpace Corporation
    Inventors: Harold V. Swanson, Robert E. Bald