Patents by Inventor Alfred G. Hall

Alfred G. Hall 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).

  • Pre-cast concrete unit for manholes
    Patent number: D246384
    Type: Grant
    Filed: August 9, 1976
    Date of Patent: November 15, 1977
    Assignee: Moduloc Concrete Products (London) Ltd.
    Inventors: Brian E. Brown, Alfred G. Hall
  • Pre-cast concrete unit for manholes
    Patent number: D247254
    Type: Grant
    Filed: August 9, 1976
    Date of Patent: February 14, 1978
    Assignee: Moduloc Concrete Products (London) Ltd.
    Inventors: Brian E. Brown, Alfred G. Hall