Patents by Inventor Llewellyn A. Rubin

Llewellyn A. Rubin 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: 4725837
    Abstract: A downhole toroidal coupled telemetry apparatus is disclosed in which the secondary winding comprises a plurality of turns wrapped around a generally annular core member.
    Type: Grant
    Filed: January 30, 1981
    Date of Patent: February 16, 1988
    Assignee: Tele-Drill, Inc.
    Inventor: Llewellyn A. Rubin
  • Patent number: 4691203
    Abstract: A system and method is described for amplifying and transmitting an information signal from a downhole drillstring location. The amplifier shifts the relatively low frequency information signal up to a high frequency level, amplifies the high frequency signal and processes it through an impedance matching transformer, and then demodulates the amplified signal back to the original low frequency for transmission through the earth to the surface, thus enabling the use of a much smaller transformer than when the information signal is processed entirely at the low frequency level. A novel transducer consisting of generally cylindrical conductive sleeves separated by an insulative gap is used to provide structural integrity and to transmit the amplified information signal. The conductive sleeves are heat shrunk onto an insulative sleeve and a central mandrel.
    Type: Grant
    Filed: July 1, 1983
    Date of Patent: September 1, 1987
    Inventors: Llewellyn A. Rubin, William H. Harrison
  • Patent number: 4218678
    Abstract: This invention relates to pulse radar detection of targets in extended media, including natural phenomena such as oil, coal and ore deposits within the earth. In particular, this invention relates to a pulse radar system employing a synthetic pulse formed from a Fourier spectrum of frequencies generated and detected by a digitally controlled transmitter and receiver circuits.
    Type: Grant
    Filed: May 11, 1979
    Date of Patent: August 19, 1980
    Assignee: Ensco, Inc.
    Inventors: James C. Fowler, Llewellyn A. Rubin, William L. Still