Patents by Inventor David W. Downham

David W. Downham 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).

  • Patent number: 5345650
    Abstract: The present invention relates to vacuum cleaners which may be in the form of so-called upright and cylinder cleaners. In the vacuum cleaner according to the invention the functions of air movement and rotation of a rotary beater or brush are separated. This results in a more flexible product, less possibility of damage to a belt driving the beater and gives a ready means for stopping the beater when the cleaner is parked. The vacuum cleaner includes a main body, a first portion and an electric fan housing coupled to a first aperture of an air duct, the first portion including a suction opening adjacent a beating means, a turbine coupled to a second aperture of the air duct and a drive line coupling between the turbine and the beating means, whereby cleaned air is directed through the duct to the turbine.
    Type: Grant
    Filed: March 30, 1993
    Date of Patent: September 13, 1994
    Assignee: Electrolux Limited
    Inventors: David W. Downham, Andrew G. Hoyte