Patents by Inventor Dennis Langdale

Dennis Langdale 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).

  • Pet litter apparatus
    Publication number: 20050076845
    Abstract: A pet litter apparatus has an upper screen to retain litter and debris, a plurality of upper bars, a lower plurality of bars, mechanism for lowering the lower plurality of bars to define spaces for passage of particulate matter between the upper and lower bars, by rotating rods on sprockets to lower the second plurality of bars.
    Type: Application
    Filed: October 14, 2003
    Publication date: April 14, 2005
    Inventor: Dennis Langdale