Patents by Inventor Alan Crawshay

Alan Crawshay 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).

  • Damper assembly for gas duct
    Patent number: 4235256
    Abstract: A damper assembly for closure of a duct for conveying hot corrosive gases is disclosed.
    Type: Grant
    Filed: May 7, 1979
    Date of Patent: November 25, 1980
    Assignee: Cominco Ltd.
    Inventor: Alan Crawshay