Patents by Inventor David J. Knablein

David J. Knablein 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).

  • Indoor greenhouse
    Patent number: 4291494
    Abstract: A portable greenhouse which includes a base, a cover, and trays. The bottom of the base is corrugated, the bottom of the trays are corrugated. The base, cover and trays all have a peripheral flange. The flanges engage with each other to form a seal around the periphery of the greenhouse. The trays have apertures in the bottom. The cover is transparent with longitudinal and lateral ribs and an air flow vent.
    Type: Grant
    Filed: August 1, 1979
    Date of Patent: September 29, 1981
    Inventors: David J. Knablein, Chandler D. Rees