Patents Represented by Attorney Hugh L. Logan

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  • Privacy transmission system with remote key control
    Patent number: 4228321
    Abstract: In the prior art key control signals are produced at a scrambling location, used at that location for scrambling and then transmitted along with the scrambled message to the unscrambling location. In accordance with the present disclosure, improved privacy is achieved by producing key control signals at the unscrambling location, using them at that location for unscrambling and also transmitting them to the scrambling location for use in scrambling.
    Type: Grant
    Filed: May 16, 1978
    Date of Patent: October 14, 1980
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: James L. Flanagan
  • Mobile microphone-transmitter assembly
    Patent number: 4224482
    Abstract: A mobile microphone-transmitter assembly is disclosed which comprises a microphone, a plurality of infrared light emitting devices, electrical apparatus connected between the microphone and the devices to energize the devices in response to inputs to the microphone and a mechanical structure for supporting the devices to produce a substantially omnidirectional, horizontal radiation pattern when the structure is worn by a user and the devices are energized.
    Type: Grant
    Filed: November 30, 1978
    Date of Patent: September 23, 1980
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Gregory Lese, Charles F. Liebler, Dilipkumar B. Patel
  • High voltage leakage and breakdown test circuit
    Patent number: 4218649
    Abstract: A circuit is disclosed for testing electrical apparatus to detect leakage and voltage breakdown failure paths and, furthermore, to indicate if the impedances in the paths are below predetermined levels and thereby to characterize the type and nature of the failure. A feature of the circuit is the use of a high voltage test source which has sufficient internal impedance to prevent hazardous currents if a user should accidentally come into contact with the source output.
    Type: Grant
    Filed: April 24, 1978
    Date of Patent: August 19, 1980
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Walter G. Kutzavitch
  • Digital circuits having nonlinear output versus input characteristics
    Patent number: 4209842
    Abstract: Unit value increments of two types are counted with the counting process starting anew each time these increments change type. As each count output is produced, it is translated into a second increment where the absolute values of these second increments are unity for at least the first count output after a change in type of the first increment and then become increasingly greater with each count output. Based upon the type of first increment, the second increments are either added or subtracted from an initial number.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: June 24, 1980
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Kenneth C. Knowlton
  • Heat detecting apparatus and method
    Patent number: 4091657
    Abstract: Apparatus and a method are disclosed for localizing excessive temperature occurring at any point along a path. In particular, a substantially constant pressure gas is applied via an orifice to a closed tubing which extends along the path. The tubing is selected to rupture at the predetermined excessive temperature. The approximate location of the rupture is determined by measuring the differential pressure across the orifice after a rupture occurs.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: May 30, 1978
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Jesse Milne Jackson