Patents Represented by Law Firm Pravel, Gambrell, Hewitt, Kimball & Kimball
  • Patent number: 5013533
    Abstract: A process for recovering heavy metals from spent catalysts on an alumina support material comprising calcining the catalyst feed material to remove impurities and smelting the calcined feed in an electric arc furnace, preferably with scrap iron. A reducing agent, such as natural gas, is injected into the furnace to reduce the heavy metals to their metallic states. The reduced metals form an alloy and separate from the alumina by gravity.
    Type: Grant
    Filed: March 1, 1990
    Date of Patent: May 7, 1991
    Inventors: Robert A. Howard, Wilson R. Barnes
  • Patent number: 4988235
    Abstract: A principal catch basin defining a certain storage capacity, the catch basis situated below the level of the ground, having an upper level opening for receiving surface water drainage thereunto, and having side walls partially constructed of permeable geotextile fabric for allowing both sub-surface air to flow into the catch basin for providing additional water absorption by the ground, and for allowing water flow and sub-surface air to flow into the catch basin for providing additional water absorption by the ground, and for allowing water flow into the sub-surface water flow through the permeable basin to serve as a collection for sub-surface drainage. The system would include the ability to create a siphon within the system so that as water drains into the principal collection basin, the water may be automatically siphoned to a distant exit point or to an exit cylinder, so that there is a constant movement of water from the principal collection point to the distant exit point.
    Type: Grant
    Filed: February 1, 1999
    Date of Patent: January 29, 1991
    Inventor: Dennis Hurley