Patents by Inventor Leon F. Strenkoski

Leon F. Strenkoski 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: 5843699
    Abstract: A rapid screening method for the detection and identification of target microorganisms in a sample which may contain both target microorganisms and competing non-target microorganisms includes the steps of enriching a sample in a mildly selective medium, incubating the sample in the growth medium for a predetermined amount of time, adding at least one inhibitor of the non-target microorganisms to the growth medium to discourage the growth of non-target microorganisms and to encourage the growth of target microorganisms. The method further includes the steps of incubating the sample in the growth medium including at least one inhibitor for a predetermined amount of time, performing biochemical assays specific for the identification of the target microorganisms, and detecting the presence of the target microorganisms in the sample. The invention further provides a system for the rapid detection of microorganisms in a sample.
    Type: Grant
    Filed: April 8, 1997
    Date of Patent: December 1, 1998
    Assignee: Difco Laboratories, Inc.
    Inventors: Leon F. Strenkoski, Maureen A. Schneider, Shoba C. Swamy, Mandar S. Nagar
  • Patent number: 5827680
    Abstract: A method for Gram staining a specimen containing bacteria includes the steps of staining Gram positive bacteria in the specimen, fixing the stain to the Gram positive bacteria, and simultaneously decolorizing and counter-staining Gram negative bacteria in the specimen.
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: October 27, 1998
    Assignee: Difco Laboratories
    Inventors: Amy Meszaros, Leon F. Strenkoski
  • Patent number: 5411893
    Abstract: A test slide (10) for performing diagnostic tests for detecting the presence of cells, their enzymes, metabolites and other cellular derivatives. The test slide (10) comprises a support strip (14), a coating (34) comprising a carrier and a diagnostic reagent disposed on the support strip (14), and a mount (12) comprising a front wall (18) and a rear wall (20). The coating (34) has the properties of being dry and stable, and water soluble. Further, the coating (34) and the diagnostic reagent are capable of rehydration. The support strip (14) is disposed between the front wall (18) and the rear wall (20) of the mount (12). Both the front (18) and rear (20) walls can have coinciding openings (28,28a) that overlie the support strip (14) thereby allowing spectroscopic, visual and microscopic examination of the support strip (14).
    Type: Grant
    Filed: March 15, 1993
    Date of Patent: May 2, 1995
    Assignee: Difco Laboratories
    Inventors: Ruth F. Eden, Jerry W. Smith, Amy T. Meszaros, Leon F. Strenkoski
  • Patent number: 5393661
    Abstract: A method for Gram staining a specimen containing bacteria includes the steps of staining Gram positive bacteria in the specimen, fixing the stain to the Gram positive bacteria, and simultaneously decolorizing and counter-staining Gram negative bacteria in the specimen.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: February 28, 1995
    Assignee: Difco Laboratories
    Inventors: Amy T. Meszaros, Leon F. Strenkoski