Patents by Inventor Douglas C. Fischer

Douglas C. Fischer 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).

  • Sample dissolution chamber
    Patent number: 5227303
    Abstract: There is disclosed an automated system for testing the sterility of products intended for human health administration or for human consumption. The system permits a plurality of samples of a product to be concurrently tested. To accomplish this, the system includes a novel apparatus for thoroughly mixing therein a plurality of product samples to assure that a statistically meaningful representation of product samples are subjected to sterility testing. The system is arranged so that multiple samples of a product to be tested are deposited in the mixing apparatus after which the mixed samples are conveyed to testing canisters along with appropriate growth media to determine that the product is sterile or that the product is free from microbial contamination.
    Type: Grant
    Filed: February 25, 1992
    Date of Patent: July 13, 1993
    Assignee: Merck & Co., Inc.
    Inventors: George R. Erdman, Douglas C. Fischer
  • Automated sterility testing system with concurrent sample dissolving, diluting and mixing
    Patent number: 5213967
    Abstract: There is disclosed an automated system for testing the sterility of products intended for human health administration or for human consumption. The system permits a plurality of samples of a product to be concurrently tested and is arranged so that multiple samples of a product to be tested can be mixed and then conveyed to test canisters along with appropriate growth media prior to determining that the product is sterile or is free from microbial contamination.
    Type: Grant
    Filed: February 25, 1992
    Date of Patent: May 25, 1993
    Assignee: Merck & Co., Inc.
    Inventors: George R. Erdman, Douglas C. Fischer