Patents by Inventor Donald L. Knapp

Donald L. Knapp 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: 5238134
    Abstract: A tamper-evident container is disclosed that can be reused a limited number of times with the tamper-evident feature for secure storage or transport of material. The container is made up of a base and a lid. The base has a hollow interior for holding material and an open top. The base also has a number of platform-like holders, each with a hole, that project perpendicular to and inwardly from the interior walls of the base. The holders are used in attaching the lid to the base. The lid is the same shape as the base (i.e., multisided, hexagonal, or circular). The lid contains frangible elements which outnumber the holders in the base. Each frangible element is made up of a shaft tipped with a cone. Frangibility of the element is achieved by dividing it into quadrants and scoring the base. Each element extends downward from the interior-top of the lid. A subset of the frangible elements align with the holders in the base. The container is closed when a subset of frangible elements engage with the holders.
    Type: Grant
    Filed: August 20, 1992
    Date of Patent: August 24, 1993
    Assignee: The United States of America as represented by the Director of the National Security Agency
    Inventor: Donald L. Knapp