Patents by Inventor Henry Bruce Marshall

Henry Bruce Marshall 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).

  • Patent number: 4118109
    Abstract: Apparatus for controlling the direction of a beam of optical radiation from, say, a laser, includes two prisms of small apex angle independently rotatable about a common axis. A control circuit is responsive to the actual angular positions of the prisms and to inputs indicating the desired beam position to cause the prisms to be moved to the appropriate positions.
    Type: Grant
    Filed: January 26, 1977
    Date of Patent: October 3, 1978
    Assignee: Ferranti Limited
    Inventors: Ian Drummond Crawford, Henry Bruce Marshall, Robert John Cormack