Patents by Inventor David Milton Spain

David Milton Spain 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).

  • Extractor for vacuum cleaning system
    Patent number: 7967883
    Abstract: An extractor for a vacuum cleaning system of the type based on a cyclonic separator. The extractor comprises an annular body located adjacent the cyclonic separator and has an annular opening communicating with the cyclonic separator. A mesh covers the annular opening. In use the air circulating in the cyclonic separator vents through the extractor but debris in the air stream is stopped by the mesh.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: June 28, 2011
    Assignee: Maxivac Pty Ltd.
    Inventor: David Milton Spain
  • Extractor for Vacuum Cleaning System
    Publication number: 20080236399
    Abstract: An extractor for a vacuum cleaning system of the type based on a cyclonic separator. The extractor comprises an annular body located adjacent the cyclonic separator and has an annular opening communicating with the cyclonic separator. A mesh covers the annular opening. In use the air circulating in the cyclonic separator vents through the extractor but debris in the air stream is stopped by the mesh.
    Type: Application
    Filed: July 21, 2006
    Publication date: October 2, 2008
    Applicant: MAXIVAC PTY LTD
    Inventor: David Milton Spain