Patents by Inventor David M. Couch

David M. Couch 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).

  • Double-walled plant pot with graduated fertilizer
    Patent number: 5044120
    Abstract: A double-walled plant pot has a single water-permeable bottom, a permeable inner side wall, and an impermeable outer side wall. The space between the walls is filled with a fertilizer mixture whose concentration of fertilizer increases with depth. Thus larger plants obtain more fertilizing nutrients. The inner wall, bottom, and outside may be separable.
    Type: Grant
    Filed: November 2, 1990
    Date of Patent: September 3, 1991
    Inventor: David M. Couch