Patents by Inventor David H. Roper

David H. Roper 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: 5681279
    Abstract: A pill dispensing syringe comprising a cylindrical outer housing, a water injection cylinder slidably mounted within the interior bore of the outer housing, a piston slidably mounted within the interior bore of the water injection cylinder, a piston rod fixedly attached to the piston and extending therefrom through the interior bores of the water injection cylinder and the outer housing, a cylindrical pill dispensing sleeve fixedly attached to the opposing end of the outer housing, the opposing end of the pill dispensing sleeve being adapted for holding a pill, and a cylindrical water injection tube slidably mounted within the interior bore of the pill dispensing sleeve, and end of the water injection tube being fixedly attached to the water injection cylinder.
    Type: Grant
    Filed: November 4, 1996
    Date of Patent: October 28, 1997
    Inventors: David H. Roper, Cathy M. Roper
  • Patent number: 5425595
    Abstract: A pop-up traffic control device (10) is raised above or withdrawn below the pavement surface through a bore in the cover (18). A lead screw (16), rotated by power source (30), raises a traffic marker tube (12) by a follower tube socket (14) attached to the lead screw (16). The follower tube socket (14) moves vertically on the lead screw (16) and is rotated to either raise or retract the traffic marker tube (12) above or below the roadway. The interior of the traffic control device is sealed from external foreign matter by a linear tube (48) in the cover bore surrounding the traffic marker tube (12). The traffic marker tube (12) is easily replaceable. Additional features include: a slope adjustment mechanism, a heating unit (74), a lead screw lubrication/cleaning arrangement (80, 82), lighting units (84) for the traffic marker tube (12), a watertight coupling (90, 92), a variable-speed arrangement for the lead screw rotation, and a marker tube status signal unit.
    Type: Grant
    Filed: August 16, 1993
    Date of Patent: June 20, 1995
    Inventor: David H. Roper
  • Patent number: 3963363
    Abstract: A pop up traffic control device stored in a cavity in the roadway when not in use and elevated to a predetermined height above the roadway by remote control when traffic control is required. The control device is attached to a follower which is engaged in the thread of a screw member. The screw member is caused to rotate by a remote signal thus causing the control member to be elevated.
    Type: Grant
    Filed: March 4, 1974
    Date of Patent: June 15, 1976
    Inventor: David H. Roper