Patents by Inventor Charles W. Townsley

Charles W. Townsley 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).

  • Specimen slide for occult blood testing
    Patent number: 4486536
    Abstract: A method and novel absorbent substrate for determining the presence of occult blood in gastric fluid. The substrate is acid treated and contains guaiac. The method includes the addition of the gastric fluid to the acid treated guaiac substrate which is developed with a buffered developing solution. Preferably the substrate is an acid treated sheet of absorbent paper and the developing solution is an aqueous buffered solution of hydrogen peroxide.
    Type: Grant
    Filed: August 19, 1982
    Date of Patent: December 4, 1984
    Assignee: Smithkline Diagnostics, Inc.
    Inventors: Josefina T. Baker, Paul J. Lawrence, Charles W. Townsley
  • Specimen slide for occult blood testing
    Patent number: 4382064
    Abstract: Specimen test slides for occult blood having a receiving sheet between a front panel and a rear panel with openings in the front and rear panels and pivotal covers coated with 2,6-di-tert-butyl-p-cresol to cover said openings.
    Type: Grant
    Filed: February 11, 1982
    Date of Patent: May 3, 1983
    Assignee: SmithKline Instruments, Inc.
    Inventors: Michael B. Detweiler, Paul J. Lawrence, Charles W. Townsley
  • Specimen test slide and method for testing occult blood
    Patent number: 4365970
    Abstract: An improved specimen test slide having a front panel and a rear panel. The front panel has one or more openings. Sheet means carrying a test reagent underlie each of these openings for reception of a specimen. A hinged cover overlies the openings. The rear panel has flap means opposite said openings which is pivotable to expose the underside of the sheet to permit application of a developing solution. The underside of the sheet which faces the rear panel also has a control area positioned on a portion thereof at some distance from the portions of the sheet underlying the openings of the front panel. The control area contains positive and negative monitors.
    Type: Grant
    Filed: May 1, 1981
    Date of Patent: December 28, 1982
    Assignee: SmithKline Instruments, Inc.
    Inventors: Paul J. Lawrence, Charles W. Townsley
  • Method of stabilizing a specimen slide for occult blood testing
    Patent number: 4329317
    Abstract: Specimen test slides for occult blood having a receiving sheet between a front panel and a rear panel with openings in the front and rear panels and pivotal covers coated with 2,6-di-tert-butyl-p-cresol to cover said openings.
    Type: Grant
    Filed: January 29, 1981
    Date of Patent: May 11, 1982
    Assignee: Smithkline Instruments, Inc.
    Inventors: Michael B. Detweiler, Paul J. Lawrence, Charles W. Townsley