Patents by Inventor David Calderhead

David Calderhead 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).

  • Concentrating immunochemical test device and method
    Patent number: 5716778
    Abstract: A method and device for determining the presence of an analyte in a sample suspected of containing the analyte is disclosed. The method involves contacting a test solution containing the sample and a first member of a specific binding pair with an end portion of a strip of bibulous material capable of being traversed by the test solution through capillary action. The first member of a specific binding pair is capable of binding the analyte. The strip contains a second member of a specific binding pair integral therewith for concentrating and non-diffusively binding the first sbp member at a small situs on the strip separated from the end portion of the strip. The detectible signal is produced in relation to the presence of the analyte in the test solution. The test solution passes through the situs as the test solution traverses the bibulous material.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: February 10, 1998
    Assignee: Abbott Laboratories
    Inventors: Litai Weng, David Calderhead, Pyare Khanna, Edwin F. Ullman
  • Concentrating immunochemical test strip
    Patent number: 4879215
    Abstract: A method and device for determining the presence of an analyte in a sample suspected of containing the analyte is disclosed. The method involves contacting a test solution containing the sample and a first member of a specific binding pair with an end portion of a strip of bibulous material capable of being traversed by the test solution through capillary action. The first member of a specific binding pair is capable of binding the analyte. The strip contains a second member of a specific binding pair integral therewith for concentrating and non-diffusively binding the first sbp member at a small situs on the strip separated from the end portion of the strip. The detectible signal is produced in relation to the presence of the analyte in the test solution. The test solution passes through the situs as the test solution traverses the bibulous material.
    Type: Grant
    Filed: March 4, 1988
    Date of Patent: November 7, 1989
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Litai Weng, David Calderhead, Pyare Khanna, Edwin F. Ullman
  • Concentrating immunochemical test device and method
    Patent number: 4740468
    Abstract: A method and device for determining the presence of an analyte in a sample suspected of containing the analyte is disclosed. The method involves contacting a test solution containing the sample and a first member of a specific binding pair with an end portion of a strip of bibulous material capable of being traversed by the test solution through capillary action. The first member of a specific binding pair is capable of binding the analyte. The strip contains a second member of a specific binding pair integral therewith for concentrating and non-diffusively binding the first sbp member at a small situs on the strip separated from the end portion of the strip. The detectible signal is produced in relation to the presence of the analyte in the test solution. The test solution passes through the situs as the test solution traverses the bibulous material.
    Type: Grant
    Filed: February 14, 1985
    Date of Patent: April 26, 1988
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Litai Weng, David Calderhead, Pyare Khanna, Edwin F. Ullman