Patents by Inventor Luther W. Schmidt

Luther W. Schmidt 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).

  • Method of isolating an analyte using a solid phase extraction medium
    Patent number: 5618438
    Abstract: A functionalized macroporous poly(styrene divinylbenzene) particle comprises at least one ionic functional group covalently bonded thereto, the functionalized particle having sorptive capability towards an analyte, said functional group being present in the range of 0.1 to 2.5 milliequivalents per gram of poly(styrene divinylbenzene). The functionalized particles can be used in a packed column or enmeshed in a nonwoven web for utility in solid phase extraction applications.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: April 8, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: James S. Fritz, Philip J. Dumont, Donald F. Hagen, Craig G. Markell, Luther W. Schmidt