Patents by Inventor Henry Laskowski

Henry Laskowski 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).

  • Sealing devices
    Patent number: 6129116
    Abstract: A sealing device for a vacuum air opening (10) of a dust bag or other dust collecting container (5) for a vacuum cleaner, has an elastic membrane (1) deflected and centrally fixed in a vacuum air opening tube (4) by means of a fixing element (2). Deflection of the flexible membrane (1) produces forces acting upon a partspherical surface (7) of the vacuum air opening tube (4), sufficient enough to ensure tight sealing of the vacuum air opening (10) and preventing any spillage of dust through the opening (10). The elastic membrane (1) is protected by a dome (3) with an opening (6) for vacuum air flow. Alternatively the membrane (1) may be mounted on a stem element (9) extending from the dome (3).
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: October 10, 2000
    Assignee: Convac, Ltd.
    Inventor: Henry Laskowski
  • Toner cartridge
    Patent number: D420043
    Type: Grant
    Filed: September 23, 1998
    Date of Patent: February 1, 2000
    Assignee: Convac, Limited
    Inventor: Henry Laskowski