Patents by Inventor Herbert Lam

Herbert Lam 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).

  • Production of stretch plastic film
    Patent number: 6413346
    Abstract: Stretch plastic film is formed by extruding suitable plastic material from an annular die as a tubular film, forming the extruded film into a bubble with air entrapped therein by collapsing the tubular film at a predetermined distance from the annular die, causing the temperature of the tubular film when collapsed to be sufficiently high to cause opposite sides of the collapsed film to become bonded together to form a blocked two layer film, and stretching the blocked two layer film to reduce its thickness.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: July 2, 2002
    Assignee: Macro Engineering & Technology Inc.
    Inventors: Mirek Planeta, Harinder Tamber, Herbert Lam
  • Production of stretch plastic film
    Patent number: 6162318
    Abstract: Stretch plastic film is formed by extruding suitable plastic material from an annular die as a tubular film, forming extruded film into a bubble with air entrapped therein by collapsing the tubular film at a predetermined distance from the annular die, and causing the temperature of the tubular film when collapsed to be sufficiently high to cause opposite sides of the collapsed film to become bonded together to form a single layer of film.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: December 19, 2000
    Assignee: Macro Engineering & Technology Inc.
    Inventors: Mirek Planeta, Harinder Tamber, Herbert Lam