Patents by Inventor Darrnell D. Krell

Darrnell D. Krell 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).

  • Protective cover for key safe
    Patent number: 5046339
    Abstract: A lock box, or key safe, is provided with a light weight, flexible, shock-absorbing jacket to minimize or eliminate marking, denting, or other damage caused by the box's inadvertently contacting areas adjacent to where it is mounted. The presently preferred jacket material is crosslinked closed cell polyethylene foam.
    Type: Grant
    Filed: April 8, 1987
    Date of Patent: September 10, 1991
    Inventor: Darrnell D. Krell
  • Key safe cover
    Patent number: D322876
    Type: Grant
    Filed: February 9, 1988
    Date of Patent: December 31, 1991
    Inventor: Darrnell D. Krell