Patents by Inventor Charles Angell

Charles Angell 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).

  • Refrigerant fluid crystallization control and prevention
    Patent number: 6155057
    Abstract: Methods of controlling crystallization of aqueous lithium halide refrigerant fluids utilizing an organic counter cation-containing salt material effective to depress the crystallization temperature of the refrigerant fluid and corresponding refrigerant fluids.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: December 5, 2000
    Assignee: Arizona Board of Regents
    Inventors: Charles A. Angell, Vesselin Velikov, Hemalata Senapati
  • Method of making solution grade calcium sulfate dihydrate
    Patent number: 5733070
    Abstract: A method of improving ground soil irrigation by employing an additive or amendment in the form of an improved synthetic solution grade calcium sulfate dihydrate composition. This composition is formulated by contacting a calcium compound having a calcium cation with a chemical agent enabling the calcium compound to yield calcium ions upon reaction with the chemical agent and which enables the calcium cation to react with an anion of the chemical agent forming a second calcium compound. The second calcium compound is reacted with a sulfur containing acid, such as sulfuric acid, to thereby form a calcium sulfate dihydrate. The compound has improved suspension characteristics and will remain in suspension for a much longer period of time than a conventional solution grade calcium sulfate dihydrate.
    Type: Grant
    Filed: January 6, 1997
    Date of Patent: March 31, 1998
    Inventor: Edwin Charles Angell