Patents by Inventor Robert S. Bradford

Robert S. Bradford 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: 10309646
    Abstract: A portable catalytic combustion heater, wherein fuel vapor (11) and air (10) are supplied to a catalyst (6) which promotes the flameless combustion of fuel and releases that. The fuel is supplied as a liquid, passes through a selectively permeable membrane (8) such that fuel vapor exits the membrane and is fed to the catalyst (6). Additional features include porous supports and means of enhancing and diminishing the catalytic rate of combustion and controlling the heat output.
    Type: Grant
    Filed: September 19, 2016
    Date of Patent: June 4, 2019
    Assignee: GHT GLOBAL HEATING TECHNOLOGIES AG
    Inventors: Robert G. Hockaday, Patrick S. Turner, Zachary R. Bradford, Marc D. DeJohn, Carlos J. Navas, Heathcliff L. Vaz
  • Patent number: 5260704
    Abstract: A direct power output digital to analog conversion of digital audio signals operates to directly convert digital audio signals into an analog power audio output signal capable of driving a speaker, such that there is no need for further amplification or modification of the audio output signal after the direct power output digital to analog conversion of the digital audio signals. The direct power output digital to analog conversion incorporates a digital-to-analog converter within the same feedback circuit as a current-to-voltage power amplifier by using a single resistive feedback network to supply the feedback signal from the output terminal of the current-to-voltage power amplifier to the summing junction of the same current-to-voltage power amplifier.
    Type: Grant
    Filed: May 31, 1991
    Date of Patent: November 9, 1993
    Assignee: Wadia Digital Corporation
    Inventors: Charles H. Hustig, Donald W. Moses, Robert S. Bradford, Jeffrey L. Ward, Wayne P. Olson, Janice L. Cox, Raymond S. Miller, Robert W. Moses, James M. Kresse
  • Patent number: 5226000
    Abstract: A method and system is provided for a digital audio system to reconstruct a digital audio signal using time domain interpolation and direct power digital-to-analog conversion. A signal processor performs the time domain interpolation on an original digital audio signal to allow for the proper recreation of the original audio signal and a direct power output digital-to-analog converter generates an analog power audio output signal from the interpolated digital audio signal that can directly drive a speaker to produce the sound waves represented by the audio output signal. The signal processor and direct power output digital-to-analog converter allow a digital audio system to more precisely reconstruct an analog power output audio signal from a digital audio signal such that there is no need for further amplification of the audio output signal and such that there will be no perceptible difference between the reconstructed digital signal and the original analog signal.
    Type: Grant
    Filed: May 31, 1991
    Date of Patent: July 6, 1993
    Assignee: Wadia Digital Corporation
    Inventors: Robert W. Moses, Raymond S. Miller, Charles H. Hustig, Donald W. Moses, Robert S. Bradford, Jeffrey L. Ward, Wayne P. Olson, Janice L. Cox, James M. Kresse
  • Patent number: 4724435
    Abstract: The data telemetry system disclosed is a complete data communications systems suitable for use by utilities such as electric companies, gas companies and water companies which can be used for meter reading and load management at individual subscribers premises. Elements of the system can also be used as a power load carrier in a premise specific local area network (LAN). With the system is disclosed, all 10,000 subscribers per exchange can be serviced. It will be understood that data can be multiplexed between a central office location and remote subscribers for any suitable purpose with the data system as disclosed. A packet switching structure is disclosed having eight to thirty-two bytes in the data message. This packet is routed between the utility and remote subscriber with routing headers being added and deleted as required by the network modules. Each successive layer of the multiplexing and switching hierarchy submultiplies the aggregate 10,000 channel capacity into fewer channels.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: February 9, 1988
    Assignee: Applied Spectrum Technologies, Inc.
    Inventors: Donald W. Moses, Robert Moses, James W. Kinne, Charles H. Hustig, Wayne P. Olson, Alan M. Doberstein, Robert S. Bradford
  • Patent number: 4672605
    Abstract: A high speed and relatively error free communications system is disclosed which enables the high speed transmission of data at a 19.2 kilobit per second rate. The data is transmitted over the same communications medium as voice transmissions, the data transmission being virtually imperceptible to the user of the analog telephone system. Connection to and from the data terminals is made through an RS232C interface. A spread spectrum technique is utilized which "whitens" the signals of the data terminal regardless of whether the terminal is idle, transmitting or receiving data. Virtual error free transmission is achieved by interleaving bits, so that noise does not destroy the data, and by error detection and correction techniques which assure that the data, as received, is identical to that transmitted. By using a variable pseudo random code, privacy of data communications are enhanced and cross-talk is substantially eliminated.
    Type: Grant
    Filed: March 20, 1984
    Date of Patent: June 9, 1987
    Assignee: Applied Spectrum Technologies, Inc.
    Inventors: Charles H. Hustig, Jeffrey L. Ward, Donald W. Moses, Robert S. Bradford
  • Patent number: 4426665
    Abstract: An automatic track following feature for use with a helical video recorder is disclosed which enables reproduction of video fields at normal speeds, fast and slow forward and reverse speeds, and at stop motion, wherein a mechanism for moving a playback head transverse to the helical tracks on a magnetic tape is provided in order to enable the head to remain centered on the track regardless of tape speeds and directions of movement. A head position control signal is generated for driving the head positioning mechanism based on a comparison of a signal based on the instantaneous tape speed with a reference speed indicating signal.
    Type: Grant
    Filed: December 1, 1982
    Date of Patent: January 17, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert S. Bradford, Marshall R. Brookhart, Bennett G. Dy
  • Patent number: 4223279
    Abstract: A pulsed electric discharge gas laser driven by a folded Blumlein transmission line with liquid dielectric. A method of preionizing and firing the laser discharge utilizing the Blumlein voltage pre-pulse for preionization and the subsequent main voltage pulse for gap switch breakdown. A spark gap switch construction with first and second elongate electrodes, with the first electrode presenting a generally rounded surface to the second electrode which incorporates a thin continuous edge facing the first electrode. An elongate apertured cathode at the lasing chamber, with an elongate preionization electrode positioned behind the cathode, and a power supply providing a preionization electrical pulse across the cathode and preionization electrode producing ions and electrons in the lasing gas prior to the main discharge between the anode and cathode.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: September 16, 1980
    Assignee: Mathematical Sciences Northwest, Inc.
    Inventors: Robert S. Bradford, Jr., Leonard W. Braverman, Jeffrey I. Levatter
  • Patent number: 4122500
    Abstract: A device for recording portions of the signals on the tape in one or more master cassettes in a desired sequence on the tape in a copy cassette. The device includes two cassette stations each including an electronically operated drive mechanism for driving the tape in a cassette at the station in either a forward or reverse direction past a record and playback head. Each station includes means for cycling the drive mechanism between forward and reverse to repetitively play a short segment of the tape in a cassette at the station, and a manually operated control for incrementally changing the segment of the tape played in each repeat cycle. By these controls an operator selects a segment of the tape in a cassette on which signals are to be copied, which segment has an end point at which signals to be added to the tape should start, and selects a segment of a tape in a master cassette from which signals are to be copied which segment has the same beginning point as the signals to be copied.
    Type: Grant
    Filed: March 11, 1977
    Date of Patent: October 24, 1978
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert S. Bradford, Richard D. Ebbinga
  • Patent number: 4041415
    Abstract: An e-beam pumped laser employs a hollow cylindrical anode and cathode structure, the cathode being externally concentric with the anode. The lasing gas is contained within a chamber formed by the anode, an optical oscillator cavity being formed between mirrors placed at opposite ends of the anode chamber. The laser gas is excited by means of an e-beam directed radially inwardly from the cathode through the walls of the anode, which are formed of a thin foil, into the laser gas cavity.
    Type: Grant
    Filed: May 7, 1976
    Date of Patent: August 9, 1977
    Assignee: Northrop Corporation
    Inventors: Earl R. Ault, Philip C. Stevens, Robert H. Sipman, Robert S. Bradford, Jr.
  • Patent number: 3970777
    Abstract: A video compensation network is disclosed in which the pedestal level and the peak white level of a composite video signal are automatically maintained within predetermined limits. The network includes two digital/feedback loops for independently detecting and generating correction signals which are used to control the respective pedestal and peak white levels. The feedback loops are activated to make incremental adjustments to the two levels once per video field.
    Type: Grant
    Filed: June 9, 1975
    Date of Patent: July 20, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert S. Bradford, Peter Amass