Patents Represented by Attorney C. Frederick Koenig
  • Patent number: 5022024
    Abstract: A system for the wireless transmission of multiple information signals utilizing digital time division circuits between a base station and a plurality of subscriber stations. The subscriber stations may be fixed or movable. The number of time division circuits is determined by the transmission quality of the signals. The base station is interconnected with an external information network, which may be analog and/or digital. The information signals are selected from the group consisting of voice, data, facsimile, video, computer and instrumentation signals. The modulation level of the signals and the power applied to the system are adjusted in accordance with signal error detection in the system. The system is provided with spatial diversity by using a plurality of antennas selectively spaced from each other to provide relatively high signal reception despite signal fading. The base station operates over a plurality of RF channel pairs.
    Type: Grant
    Filed: May 8, 1989
    Date of Patent: June 4, 1991
    Assignee: International Mobile Machines Corporation
    Inventors: Eric Paneth, Mark J. Handzel, Steven A. Morley, Graham M. Avis
  • Patent number: 5008900
    Abstract: A subscriber unit for wireless communication with a base station in a wireless subscriber communication system includes a FIR chip, a DIF (digital intermediate frequency) chip, a single processor chip and a radio. The processor chip transcodes a digital voice input signal to provide digital input symbols; demodulates an output signal received from the base station to provide digital output symbols; and synthesizes a digital voice output signal from the digital output symbols. The FIR chip FIR filters the digital input symbols and generates timing signals for timing the transcoding and synthesizing operations in the processor chip. The DIF chip digitally synthesizes a digital intermediate frequency signal by direct digital synthesis (DDS) and modulates the digital intermediate frequency signal with the filtered input symbols to provide a modulated intermediate frequency input signal. The radio further processes the modulated input signal for transmission to the base station.
    Type: Grant
    Filed: August 14, 1989
    Date of Patent: April 16, 1991
    Assignee: International Mobile Machines Corporation
    Inventors: David N. Critchlow, Moshe Yehushua, Graham M. Avis, Wade L. Heimbigner, Karle J. Johnson, George A. Wiley
  • Patent number: 4994802
    Abstract: An analog to digital converter system utilizable in a wireless digital telephone network, the system comprising a circuit to produce an analog signal, and a circuit for amplifying this signal, mixing the amplified signal with a signal from a timing circuit and applying the output of the mixer to a sample and hold circuit; the output of the sample and hold circuit being then applied to an analog to digital converter, the output of which is applied to a FIFO, whose output is then available for further processing.
    Type: Grant
    Filed: October 12, 1988
    Date of Patent: February 19, 1991
    Assignee: International Mobile Machines Corporation
    Inventors: David N. Critchlow, Graham M. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana, Gregory L. Westling, Eric Paneth, Moshe Yehushua
  • Patent number: 4974099
    Abstract: A telecommunication system and method for communicating communication signals between various stations over a selected carrier medium. An improved encoder and method is provided for compressing a communication signal into a selectively formatted encoded signal to facilitate its transmission over the selected carrier medium. The method is particularly useful for encoding fax and modem data signals which do not exhibit the harmonics of a voice signal. A decoder and method for reconstruction of the encoded signal are also provided.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: November 27, 1990
    Assignee: International Mobile Machines Corporation
    Inventors: Daniel Lin, Scott D. Kurtz, Brian M. McCarthy, James M. Kresse
  • Patent number: 4273148
    Abstract: In a ball valve including a cylindrical housing having a flow passage, a rotatable ball for selectively blocking the flow passage, and an external actuating handle, a fire safe stem seal comprising a stem having a selected diameter with a larger diametered shoulder portion on one end which is keyed for engaging the ball, and an opposite end for engagement with the actuating handle, the housing having a stem bore for matingly receiving the stem therethrough within a selected tolerance, a first interior step concentric with the stem bore and selectively sized to accommodate the stem shoulder, a second smaller selectively sized interior step concentric with the stem bore having a selected axial depth, a deformable heat-resistance second seal ring having an axial thickness substantially greater than the axial depth of the second step for engagement with the housing in the second step, a heat-destructible primary seal and bearing ring for engagement with the housing and the heat-resistant ring in the first step, a
    Type: Grant
    Filed: April 21, 1980
    Date of Patent: June 16, 1981
    Assignee: Litton Industrial Products, Inc.
    Inventor: Raymond J. Charland
  • Patent number: 4252388
    Abstract: A slip ring mounted in a buoy is used to transmit power from a generating vessel to an offshore installation. The vessel is moored to the buoy and the slip ring acts as an electric swivel allowing the vessel to weathervane around the buoy as environmental conditions may require. The slip ring conducts high voltage three phase power and an open ring stack allows circulation of high dielectric insulating oil therethrough. The insulating oil allows the ring stack to have smaller dimensions than would be possible if an air dielectric were used. Access ports and viewing windows enable maintenance to be performed on the ring without removing the outer housing.
    Type: Grant
    Filed: May 21, 1979
    Date of Patent: February 24, 1981
    Assignee: Litton Systems, Inc.
    Inventor: Sherwin L. Brady