Patents by Inventor David Rack

David Rack 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).

  • Plant holder and process for producing the same
    Patent number: 3961445
    Abstract: A plant holder arrangement in which an elastic binding material interconnects a substrate mixture of peat, humus, loam, as well as organic and/or mineral fertilizers. The substrate consists of a mixture of 30 - 70 percent by volume of polyurethane foam flakes with a particle size of 3 - 15 mm.
    Type: Grant
    Filed: February 12, 1974
    Date of Patent: June 8, 1976
    Assignee: Plana-GmbH
    Inventor: David Rack