Patents by Inventor Robert H. Edwards

Robert H. Edwards 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).

  • Recombinant nerve growth factor
    Patent number: 5683894
    Abstract: A method for producing pure, active, mature recombinant Nerve Growth Factor-beta is disclosed, as is the protein so produced.
    Type: Grant
    Filed: March 7, 1991
    Date of Patent: November 4, 1997
    Assignee: University of California
    Inventors: Robert H. Edwards, William J. Rutter
  • Resistance wire heating element
    Patent number: 5083012
    Abstract: An improved single heating element for a furnace, and method of designing the circuit is provided.In the method of design and constructing the heating element, the voltage level of the furnace is determined, the operating temperature of the furnace is determined and then the watt level output is selected. A resistance wire is selected and the watt-density of the wire is calculated as if it were to be connected in a single strand in series. If the calculation yields a value greater than the maximum safe watt density, the watt-density is recalculated as if the wire were connected as two wires in parallel, and this calculation is repeated with an additional wire in parallel as many times as necessary to provide a watt-density less than the maximum safe watt density and constructing a furnace heating element with said finally determined number of wires in parallel.
    Type: Grant
    Filed: May 30, 1990
    Date of Patent: January 21, 1992
    Assignee: Custom Electric Manufacturing Company
    Inventor: Robert H. Edwards
  • Process for removing solvent from the raffinate of extracted phosphoric acid and for preparing phosphate salts
    Patent number: 4132540
    Abstract: When crude wet process phosphoric acid is solvent extracted, an aqueous raffinate containing phosphoric acid and a small amount of solvent is produced as a by-product. Certain materials are added to the raffinate, in order to produce two phases, one aqueous and the other of solvent. The phases are separated, the solvent recycled for reuse in a solvent extraction process and the aqueous phase treated with ammonia or alkali or alkaline earth metal compounds to form a fertilizer or other phosphate salt.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: January 2, 1979
    Assignee: Albright & Wilson Limited
    Inventors: Robert H. Edwards, Thomas A. Williams