Patents by Inventor Roland Westerdal

Roland Westerdal 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).

  • Reading safety glasses
    Publication number: 20030142264
    Abstract: Safety glasses have a one-piece unitary lens with a left eye plano-convex portion and a right eye plano-convex portion, each having an independent radius of curvature in the range of 5 to 8 diopters. A corrective lens segment is integrally positioned in each plano-convex portion. The corrective lens segments are preferably semi-circular with a straight upper edge and are surrounded by the plano-convex portion.
    Type: Application
    Filed: September 23, 2002
    Publication date: July 31, 2003
    Inventors: Roland Westerdal, Chunhuang Li
  • Earplug and earplug set
    Patent number: 4314553
    Abstract: An earplug comprising a stem portion and a front portion mounted on the stem portion. The front portion is conically shaped and disposed such that the inner surface of the front portion is spaced from the stem portion. At least one spacing member may be provided which is adapted to space the interior surface of the front portion from the stem portion.The earplug may further comprise an axial bore therein adapted to receive a cord such that two of the earplugs may be connected by the cord so as to form a set.
    Type: Grant
    Filed: August 8, 1979
    Date of Patent: February 9, 1982
    Assignee: Bilsom AB
    Inventor: Roland Westerdal
  • Protective ear cup
    Patent number: D544650
    Type: Grant
    Filed: August 23, 2005
    Date of Patent: June 12, 2007
    Inventor: Roland Westerdal
  • Ear cup
    Patent number: D375584
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: November 12, 1996
    Inventor: Roland Westerdal
  • Head band hearing protector
    Patent number: D381414
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: July 22, 1997
    Inventor: Roland Westerdal
  • Pair of ear cups
    Patent number: D385665
    Type: Grant
    Filed: July 31, 1996
    Date of Patent: October 28, 1997
    Inventor: Roland Westerdal
  • Safety helmet
    Patent number: D648899
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: November 15, 2011
    Assignee: Elvex Corporation
    Inventor: Roland Westerdal
  • Ear plug
    Patent number: D408526
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: April 20, 1999
    Inventor: Roland Westerdal
  • Head band hearing protector
    Patent number: D412976
    Type: Grant
    Filed: December 16, 1996
    Date of Patent: August 17, 1999
    Inventor: Roland Westerdal
  • Ear plug
    Patent number: D435645
    Type: Grant
    Filed: August 11, 1999
    Date of Patent: December 26, 2000
    Inventor: Roland Westerdal