Patents by Inventor Steven Estergreen

Steven Estergreen 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).

  • Exchanger and method for manufacturing the same
    Patent number: 5468449
    Abstract: A method for manufacturing an exchanger includes the steps of folding sheet material in a series of pleats, placing the folded sheet material in a casing having an opening defined by walls with distal edges, covering the distal edges with end portions of the sheet material, and affixing a cover to the casing by simultaneously melting a portion of the cover and the sheet covered distal edges of the walls, and contacting the cover with the sheet material covering the distal edges of the walls. The method may also include melting a portion of the cover and/or the casing and placing the melted cover on the casing so that the melted portion contacts pleats of the sheet material, and permitting the melted material to cool and solidify and form a bond with the sheet material.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: November 21, 1995
    Assignee: Cobe Laboratories, Inc.
    Inventors: Axel Sjogren, Gary Carson, Steven Estergreen, Timothy Taga, Rodger Stewart