Patents by Inventor Richard Lee Christiansen

Richard Lee Christiansen 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: 5639925
    Abstract: Discussed is a process for preventing clathrate hydrate masses from detrimentally impeding the possible flow of a fluid susceptible to clathrate hydrate formation. The process is particularly useful in the natural gas and petroleum production, transportation and processing industry where gas hydrate formation can cause serious problems. Additives preferably contain one or more five member, six member and/or seven member cyclic chemical groupings. Additives include polymers having lactam rings. Additives can also contain polyelectrolytes that are believed to improve conformance of polymer additives through steric hinderance and/or charge repulsion. Also, polymers having an amide on which a C.sub.1 -C.sub.4 group is attached to the nitrogen and/or the carbonyl carbon of the amide may be used alone, or in combination with ring-containing polymers for enhanced effectiveness.
    Type: Grant
    Filed: December 15, 1994
    Date of Patent: June 17, 1997
    Assignee: Colorado School of Mines
    Inventors: Earle Dendy Sloan, Jr., Richard Lee Christiansen, Joseph P. Lederhos, Jin Ping Long, Vaithilingam Panchalingam, Yahe Du, Amadeu Kun Wan Sum