Patents by Inventor William D. Atwood

William D. Atwood 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).

  • Guardrail block
    Patent number: 6308936
    Abstract: A guardrail post block made from recycled plastic waste material. The block is of generally rectangular construction whose side faces have large radiused channels formed therealong and large transverse voids extending through the center of the block between the channels. The channels and voids substantially reduce the weight of the block while maintaining required strength.
    Type: Grant
    Filed: March 10, 1999
    Date of Patent: October 30, 2001
    Inventor: William D. Atwood