Patents by Inventor Paul Baran

Paul Baran 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: 5097350
    Abstract: A converter applique that fits onto and retrofits existing low priced plain paper electrostatic copiers is discussed herein. The applique of the present invention contains all of the additional elements needed to provide the full functionality of a plain paper facsimile transceiver. Additionally, the applique of the present invention removably mounts on a plain paper copier and converts it to serve as a facsimile transceiver while preserving the functionality of the copier even when the applique is in place on the copier. Further the applique of the present invention makes no electrical contact with the internal circuits of the copier, and only makes mechanical contact to the non-movable portions of the outer case of the copier where it is positioned precisely to align the laser beam in the applique with the photosensitive drum within the copier.
    Type: Grant
    Filed: June 6, 1990
    Date of Patent: March 17, 1992
    Assignee: Interfax, Inc.
    Inventor: Paul Baran
  • Patent number: 4939451
    Abstract: Various combinations of three elements are disclosed for use in accurate measurement of power through current measurement over a wide dynamic range, namely, a current shunt which is preferably an isothermal current shunt, a current transformer, which is preferably a high initial permeability current transformer, and a low-impedance burden load, which in the preferred embodiment includes an active negative impedance element which causes the removal of the effects of excitation current by canceling secondary winding resistance of the current transformer. In a specific embodiment of an isothermal current shunt according to the invention, a very linear device is achieved by construction out of copper in such a manner that the poor resistance versus temperature coefficient of copper does not affect the accuracy of measurement. Specifically, the shunt is constructed in an unbalanced isothermal bridge configuration, so that heat-induced variations are suppressed.
    Type: Grant
    Filed: January 6, 1989
    Date of Patent: July 3, 1990
    Assignee: Metricom, Inc.
    Inventors: Paul Baran, Timothy J. Knutson
  • Patent number: 4903261
    Abstract: A packet communications network and apparatus for communicating information in voice and data packets transmits and receives voice and data in accordance with standardized frames of a standardized communications format such as a standard DS-1 type trunk. An apparatus is coupled to multiplex standardized channels into a single channel wherein voice or data signals are packetized into independently addressable packets synchronized on, for example, the DS-1 frame. The network includes voice and packet data concentration apparatus operable in a multiple node trunk environment to concentrate signals into independently addressable synchronously switchable packets, thereby to provide an efficient (high density capacity) interface between trunk terminations. Up to four times as much information can be transferred between nodes with the ability to switch between nodes as compared to conventional TDM and PCM communication without compression without the ability to switch between nodes.
    Type: Grant
    Filed: March 9, 1988
    Date of Patent: February 20, 1990
    Assignee: Stratacom, Inc.
    Inventors: Paul Baran, Charles M. Corbalis, Brian D. Holden, Jon K. Masatsugu, Lewis J. Marggraff, David P. Owen, Peter W. J. Stonebridge
  • Patent number: 4893333
    Abstract: This invention allows unmodified CCITT Group 3 and 4 facsimile transceivers to interactively select and retrieve facsimile pages from a shared facsimile data base FAX serve system ("FAX server"). The remote facsimile transceiver user marks a paper selector sheet forms using a pencil or pen. The selector sheet is transmitted via the remote facsimile transmitter, preferably in a turn-around polling mode, to the FAX server unit. The FAX server unit processes the facsimile signal rapidly, interpreting the selector sheet and selecting the pages desired to be retrieved prior to the normal CCITT Recommendation T.30 timeout, which would otherwise abort the line connection. The invention allows the requested information to be returned during the same telephone call. If turn-around polling is not available, then the FAX server initiates alternative strategies culminating in an automatic callback with the information desired.
    Type: Grant
    Filed: March 14, 1989
    Date of Patent: January 9, 1990
    Inventors: Paul Baran, David F. Baran
  • Patent number: 4835463
    Abstract: Various combinations of three elements are disclosed for use in accurate measurement of power through current measurement over a wide dynamic range, namely, a current shunt which is preferably an isothermal current shunt, a current transformer, which is preferably a high initial permeability current transformer, and a low-impedance burden load, which in the preferred embodiment includes an active negative impedance element which causes the removal of the effects of excitation current by canceling secondary winding resistance of the current transformer. In a specific embodiment of an isothermal current shunt according to the invention, a very linear device is achieved by construction out of copper in such a manner that the poor resistance versus temperature coefficient of copper does not affect the accuracy of measurement. Specifically, the shunt is constructed in an unbalanced isothermal bridge configuration, so that heat-induced variations are suppressed.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: May 30, 1989
    Assignee: Metricom, Inc.
    Inventors: Paul Baran, Timothy J. Knutson
  • Patent number: 4819228
    Abstract: A packet communications network and apparatus for communicating information in voice and data packets transmits and receives voice and data in accordance with standardized frames of a standardized communications format such as a standard DS-1 type trunk. An apparatus is coupled to multiplex standardized channels into a single channel wherein voice or data signals are packetized into independently addressable packets synchronized on, for example, the DS-1 frame. The network includes voice and packet data concentration apparatus operable in a multiple node trunk environment to concentrate signals into independently addressable synchronously switchable packets, thereby to provide an efficient (high data capacity) interface between trunk terminations. Up to four times as much information can be transferred between nodes with the ability to switch between nodes as compared to conventional TDM and PCM communication without compression without the ability to switch between nodes.
    Type: Grant
    Filed: October 15, 1987
    Date of Patent: April 4, 1989
    Assignee: Stratacom Inc.
    Inventors: Paul Baran, Charles M. Corbalis, Brian D. Holden, Jon K. Masatsugu, Lewis J. Marggraff, David P. Owen, Peter W. J. Stonebridge
  • Patent number: 4771425
    Abstract: A packet communications network and apparatus for communicating information in voice and data packets transmits and receives voice and data in accordance with standardized frames of a standardized communications format such as a standard DS-1 type trunk. An apparatus is coupled to multiplex standardized channels into a single channel wherein voice or data signals are packetized into independently addressable packets synchronized on, for example, the DS-1 frame. The network includes voice and packet data concentration apparatus operable in a multiple node trunk environment to concentrate signals into independently addressable synchronously switchable packets, thereby to provide an efficient (high data capacity) interface between trunk terminations. Up to four times as much information can be transferred between nodes with the ability to switch between nodes as compared to conventional TDM and PCM communication without compression without the ability to switch between nodes.
    Type: Grant
    Filed: October 29, 1984
    Date of Patent: September 13, 1988
    Assignee: StrataCom, Inc.
    Inventors: Paul Baran, Charles M. Corbalis, Brian D. Holden, Jon K. Masatsugu, Lewis J. Marggraff, David P. Owen, Peter W. J. Stonebridge
  • Patent number: 4509073
    Abstract: A two-way (interactive) cable television system is disclosed which has distributed processing and which employs a cable-distribution subsystem that includes corrective regenerators each of which ignores noise (invalid signals) and, when overloaded, ignores (rejects) certain valid signals so as to favor older information (commands).
    Type: Grant
    Filed: April 29, 1982
    Date of Patent: April 2, 1985
    Assignee: Packet Technologies, Inc.
    Inventors: Paul Baran, Maarten R. Pranger
  • Patent number: 4455651
    Abstract: A satellite communications system, which is inherently power limited, employing spread spectrum techniques in order to trade-off bandwidth for small ground station antennas. In a one-way system embodiment a central station transmits data to a satellite for relay to a large number of small antenna receiving stations, the transmissions being spread spectrum encoded with spreading code lengths selected to provide adequate data recovery at the least sensitive station to which the transmissions are directed. Spreading codes may also function to address particular stations. In a two-way system embodiment, the central station additionally functions as a terrestrial relay station.
    Type: Grant
    Filed: October 20, 1980
    Date of Patent: June 19, 1984
    Assignee: Equatorial Communications Company
    Inventor: Paul Baran
  • Patent number: 4438511
    Abstract: A high speed digital data modem particularly suited for use on a dial up telephone line is disclosed. For the transmit ensemble, the telephone passband is divided into sixty-four sub-bands each with a carrier located approximately in the center of each sub-band. Each carrier is amplitude and phase modulated in order to encode five (5) bits. One carrier is used as a reference signal for phase and amplitude. The modulated carriers can be changed in data content every epoch. By use of packetization of data, individual amplitude correction, and individual phase correction for each carrier, the high speed modem may achieve up to 12000 bps over a dial up line with a simultaneous 300 bps reverse channel.
    Type: Grant
    Filed: November 10, 1980
    Date of Patent: March 20, 1984
    Assignee: Telebit Corporation
    Inventor: Paul Baran
  • Patent number: 4195937
    Abstract: An electroresistive printing or writing system in which a long lasting balanced erosion rate electrode head is transported in relation to a front surface conducting writing receiver media held in a defined path between a resilient flat platen and a path referencing grounding member which contacts the conductive surface below the head. Writing is accomplished on either treated paper or a plain untreated receiving surface, such as paper, by use of a tri-layered film, having a heat transferable ink layer for marking the plain surface in response to vaporization or burning away of the front conductive surface at a head electrode caused by electric current flowing via that head electrode. The mechanical configuration of the system provides immediate unobstructed operator viewing of the just completed printing.
    Type: Grant
    Filed: September 19, 1977
    Date of Patent: April 1, 1980
    Assignee: Termcom, Inc.
    Inventor: Paul Baran
  • Patent number: RE32905
    Abstract: A satellite communication system, which is inherently power limited, employing spread spectrum techniques in order to trade-off bandwidth for small ground station antennas. In a one-way system embodiment a central station transmits data to a satellite for relay to a large number of small antenna receiving stations, the transmissions being spread spectrum encoded with spreading code lengths selected to provide adequate data recovery at the least sensitive station to which the transmissions are directed. Spreading codes may also function to address particular stations. In a two-way system embodiment, the central station additionally functions as a terrestrial relay station.
    Type: Grant
    Filed: August 3, 1988
    Date of Patent: April 11, 1989
    Assignee: Equatorial Communications Company
    Inventor: Paul Baran