Patents by Inventor Glenn F. Dennis

Glenn F. Dennis 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).

  • Litter sifter tray with angularly adjustable side walls
    Patent number: 5419282
    Abstract: A cat litter box sifter comprises (1) a rectangular tray bottom with perforations extending throughout the length and width dimensions of said tray bottom and (2) four side walls, each extending upwardly from one respective side edge of the rectangular tray with perforations extending throughout the length and width dimensions of each side wall. Multiple trays are assembled from a preformed litter sifter sheet material and nested together in a cat box below the level of granular litter material within the cat box. Single trays can be removed successively to effectively remove fecal matter without also removing the granular litter material, thus extending its duration of use.
    Type: Grant
    Filed: September 13, 1993
    Date of Patent: May 30, 1995
    Inventor: Glenn F. Dennis