Patents by Inventor David L. Harper

David L. Harper 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).

  • Protective enclosure for a multi-chip module
    Patent number: 6088228
    Abstract: A heat dissipating element, positioned inside a protective cover, removes heat from the vicinity of a multi-chip module comprising active semiconductor devices attached to a printed circuit board. Attachment of the protective cover to the printed circuit board uses a latching mechanism with minimum board space requirements.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: July 11, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Kurt H. Petersen, David L. Harper
  • Agarose compositions for nucleic acid sequencing
    Patent number: 5455344
    Abstract: A nucleic acid sequencing gel comprising 2 to 10% of a gelling polysaccharide, preferably agarose; a denaturing agent, a non-gelling additive, preferably glycerol, and electrophoretic buffers. This composition is capable of resolving nucleic acid fragments having at least 50 bases and which differ from each other by at least one base.
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: October 3, 1995
    Assignee: FMC Corporation
    Inventors: David L. Harper, Jonathan H. Morgan, Samuel Nochumson, Mikhail V. Ostrovsky, Donald W. Renn, William C. Snow
  • Conversion device for drills
    Patent number: 5282638
    Abstract: A device for converting power or hand drills to drive sockets. The cylinder of the device attaches to the drill in place of the chuck, or, with an adaptor, as a bit would fit in the chuck. The cylinder also houses the known, toothed gear assembly which drives the socket. The cylinder is surrounded by a slidable ring and pierced by a push rod attached to opposite sides of the ring. The ring and push rod are pushed forward, and the push rod activates the release mechanism of the gear assembly.
    Type: Grant
    Filed: December 29, 1992
    Date of Patent: February 1, 1994
    Inventor: David L. Harper