Patents by Inventor Alvin P. Callahan

Alvin P. Callahan 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).

  • Tungsten-188/carrier-free rhenium-188 perrhenic acid generator system
    Patent number: 5275802
    Abstract: A generator system for providing a carrier-free radioisotope in the form of an acid comprises a chromatography column in tandem fluid connection with an ion exchange column, the chromatography column containing a charge of a radioactive parent isotope. The chromatography column, charged with a parent isotope, is eluted with an alkali metal salt solution to generate the radioisotope in the form of an intermediate solution, which is passed through the ion-exchange column to convert the radioisotope to a carrier-free acid form.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: January 4, 1994
    Assignee: Martin Marietta Energy Systems, Inc.
    Inventors: Furn F. Knapp, Jr., Edward C. Lisic, Saed Mirzadeh, Alvin P. Callahan
  • Tungsten-188/carrier-free rhenium-188 perrhenic acid generator system
    Patent number: 5186913
    Abstract: A generator system for providing a carrier-free radioisotope in the form of an acid comprises a chromatography column in tandem fluid connection with an ion exchange column, the chromatography column containing a charge of a radioactive parent isotope. The chromatography column, charged with a parent isotope, is eluted with an alkali metal salt solution to generate the radioisotope in the form of an intermediate solution, which is passed through the ion-exchange column to convert the radioisotope to a carrier-free acid form.
    Type: Grant
    Filed: April 26, 1991
    Date of Patent: February 16, 1993
    Assignee: Martin Marietta Energy Systems, Inc.
    Inventors: Furn F. Knapp, Jr., Edward C. Lisic, Saed Mirzadeh, Alvin P. Callahan