Patents by Inventor Philip H. Stevenson

Philip H. Stevenson 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).

  • Filter system
    Patent number: 5651811
    Abstract: A vacuum cleaner having a reduced velocity chamber with a high velocity air inlet, an electric motor, a rotary mechanism driven by the motor for creating a vacuum in the chamber, an outlet for exhausting air from the chamber, which air flows in a selected path from the air inlet, through the chamber and out the air exhaust outlet and a disposable porous sheet filter layer in the chamber for removing solids particles from the air. The vacuum cleaner also has a fiber filter between the filter layer and the motor where the fiber filter has an electrically charged non-woven material for removing very fine air particles in the chamber, intersecting the air path and generally coterminous with the disposable filter layer.
    Type: Grant
    Filed: April 15, 1996
    Date of Patent: July 29, 1997
    Assignee: HMI Industries, Inc.
    Inventors: Robert A. Frey, Philip H. Stevenson
  • Filter system
    Patent number: 5593479
    Abstract: A vacuum cleaner having a reduced velocity chamber with a high velocity air inlet, an electric motor, a rotary mechanism driven by the motor for creating a vacuum in the chamber, an outlet for exhausting air from the chamber, which air flows in a selected path from the air inlet, through the chamber and out the air exhaust outlet and a disposable porous sheet filter layer in the chamber for removing solids particles from the air. The vacuum cleaner also has a fiber filter between the filter layer and the motor where the fiber filter has an electrically charged non-woven material for removing very fine air particles in the chamber, intersecting the air path and generally coterminous with the disposable filter layer.
    Type: Grant
    Filed: February 2, 1995
    Date of Patent: January 14, 1997
    Assignee: HMI Industries, Inc.
    Inventors: Robert A. Frey, Philip H. Stevenson
  • Vacuum cleaner and filter thereof
    Patent number: 5248323
    Abstract: In a vacuum cleaner comprising a reduced velocity chamber with a high velocity air inlet, an electric motor, a rotary means driven by the motor for creating a vacuum in the chamber, an outlet for exhausting air from the chamber, which air flows in a selected path from the air inlet, through the chamber and out the air exhaust outlet and a disposable porous sheet filter layer in the chamber for removing solids particles from the air there is provided an improvement comprising a gas removing filter between the filter layer and the motor where the gas removing filter comprises an activated charcoal filter layer in the chamber, intersecting the air path and generally coterminous with the disposable filter layer.
    Type: Grant
    Filed: November 9, 1992
    Date of Patent: September 28, 1993
    Assignee: Health-Mor, Inc.
    Inventor: Philip H. Stevenson