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).

  • Publication number: 20050039212
    Abstract: A construction arrangement for a small set-top box to protect cryptographic capabilities and prevent a digital program in clear from being able to be tapped as required by Digital Rights Management protocols. A first layer of sheet metal capable of blocking X-rays, is formed as a shallow pan to hold a set of printed circuit boards. A second layer has a thin epoxy based printed circuit material. A third layer has a printed circuit board with integrated components placed on top of the second layer. A fourth layer has a three layer thin printed circuit board with a first and second metallic layer and holes for large components, such as electrolytic capacitors. A black liquid thermosetting epoxy fills the interstices between the sheet metal layer and the second layer, and between the second layer and the third layer, and between the third layer and the fourth layer, thereby preventing access to exposed circuit trace carrying digital signals in the clear.
    Type: Application
    Filed: August 4, 2004
    Publication date: February 17, 2005
    Inventors: Paul Baran, Xu Lin, John Pickens, Michael Field
  • Publication number: 20030200548
    Abstract: A system for the delivery of video on demand (VOD). A wireless remote control device generates keystroke signals for controlling a TV display and has a single button for restarting a selected program at a beginning of the selected program. A head-end unit supports separate downstream virtual channels for each separate TV set connected on a common TV feeder-cable; The head-end unit locally records and stores many programs, and transmits each program using a compressed digital format. The Compressed digital format may use MPEG-2 or MPEG-4. The head-end unit has means for protecting against signal theft. A set top unit encapsulates the keystroke signals and transmits the keystroke signals via a two-way channel to the head-end unit.
    Type: Application
    Filed: December 23, 2002
    Publication date: October 23, 2003
    Inventors: Paul Baran, Xu Duan Lin, John Pickens, Michael Field
  • Patent number: 6094211
    Abstract: This invention permits the upstream transmission of short packets of information in a cable TV system, and blocking upstream noise at all other times, and does so without interfering with image quality of normal TV viewing. A remotely operable ingress noise blocking filter is placed at the terminating junction between a subscriber's coaxial drop cable and a corresponding feeder tap in a cable TV system. The ingress noise blocking filter contains a high pass filter to pass the normal TV band. This high pass filter is bypassed by a section containing low pass filters and a switch operated when receiving a control signal from a cable modem during those short durations the cable modem is authorized to transmit an upstream signal. Low pass filters isolate the switching elements so that switching transients cannot occur in the downstream TV band. The level of the amplitude of the downstream signal is unaffected whether the switching elements are open or closed.
    Type: Grant
    Filed: August 15, 1996
    Date of Patent: July 25, 2000
    Assignee: COM21, Inc.
    Inventors: Paul Baran, George K. Bunya, Marshall H. Hollimon, F. Jud Heinzmann
  • Patent number: 6081533
    Abstract: A method for enhancing the functionalities of a subscriber terminal unit (STU) or ADSL terminal unit (ATU) through the use of different types of application interface modules (AIMs). This is accomplished by incorporating a slot in the STU/ATU through which a detachable AIM can be inserted and electrically coupled to the STU/ATU. The STU/ATU has circuitry for determining which particular type of AIM has been inserted. Depending on the type of AIM that has been inserted in the STU/ATU (e.g., installation, telephony, diagnostics, network interface, television, etc.), management information specific to the particular AIM is sent by the STU/ATU upstream to the headend unit. In response, the headend unit provides applications service(s) to the STU/ATU, depending on the particular type of device inserted into the subscriber terminal unit.
    Type: Grant
    Filed: June 25, 1997
    Date of Patent: June 27, 2000
    Assignee: Com21, Inc.
    Inventors: Mark Laubach, Paul Baran, Ali Raissinia, Kenneth Gorman, Sanford Helton
  • Patent number: 6075972
    Abstract: A two-way CATV network having a radio return path. A cable headend controller is used to control downstream as well as upstream communications over the two-way CATV network. Downstream signals are sent to subscribers' cable modems through conventional coaxial cables. On the upstream side, a signal generated at a first frequency by an interactive cable modem. This signal is then sent to a transmitter applique, which converts the signal to a second frequency. The signal is then transmitted through a wireless segment at this second frequency to a receiver applique. The receiver applique converts the transmitted signal into a third frequency. In some cases, the third frequency is the same as the third frequency. Eventually, the upstream signal is sent to the headend controller. Throughout the entire upstream transmission process, the same signal is maintained; only its frequency is changed.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: June 13, 2000
    Assignee: COM21, Inc.
    Inventors: Mark Laubach, Paul Baran
  • Patent number: 6049693
    Abstract: A plurality of intelligently-controlled frequency-domain filters or ingress noise blockers are disposed in serial connection to coaxial cable at feeder tap locations that connect each household node to the cable. Each filter is operative in the absence of upstream signals from the local node to block ingress energy in the upstream band and is responsive to energy produced by injected upstream signals in the upstream band only from the associated local node to unblock and thus pass information signals into the upstream band. The filter employs as its blocking/unblocking mechanism an active switch whose control signal, as well as power source, is the energy of the injected upstream signal, which may be largely the information-containing signal from the associated local node which is to be gated through to the head end. The switch is able to respond quickly to microvolt level signals. The active switch is preferably a depletion-mode-type field effect transistor (depletion mode FET).
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: April 11, 2000
    Assignee: Com21, Inc.
    Inventors: Paul Baran, George K. Bunya, F. Jud Heinzmann, Marshall H. Hollimon
  • Patent number: 5926479
    Abstract: A bi-directional communications system for bypassing a local exchange carrier telephone system for conveying data between at least one terminal unit and a switching unit that has the functionality of a Class 5 central telephone office switch that is connected to a public switched telephone network. The system includes a relay transceiver where the signals from the terminal units are converted bi-directionally between the signal format of the terminal units and fixed length compliant ATM cells when the signal format of the terminal units is other than a fixed length compliant ATM cell format.
    Type: Grant
    Filed: April 24, 1997
    Date of Patent: July 20, 1999
    Assignee: Com 21, Inc.
    Inventor: Paul Baran
  • Patent number: 5870134
    Abstract: A two-way CATV network having a radio return path. A cable headend controller is used to control downstream as well as upstream communications over the two-way CATV network. Downstream signals are sent to subscribers' cable modems through conventional coaxial cables. On the upstream side, a signal generated at a first frequency by an interactive cable modem. This signal is then sent to a transmitter applique, which converts the signal to a second frequency. The signal is then transmitted through a wireless segment at this second frequency to a receiver applique. The receiver applique converts the transmitted signal into a third frequency. In some cases, the first frequency is the same as the third frequency. Eventually, the upstream signal is sent to the headend controller. Throughout the entire upstream transmission process, the same signal is maintained; only its frequency is changed.
    Type: Grant
    Filed: March 4, 1997
    Date of Patent: February 9, 1999
    Assignee: Com21, Inc.
    Inventors: Mark Laubach, Paul Baran
  • Patent number: 5870395
    Abstract: 53 byte length ATM compliant cells are transmitted over a digital optical fiber path to interconnect with a coaxial feeder cable TV system to support two-way digital services at a plurality of sites connected to the TV cable system. At the point of interconnection between the fiber optic path and the cable TV feeder subsystem, digital signals are converted to a UHF rf carrier frequency above the cutoff pass-band of the analog signal feeder amplifier carrying TV broadcast signals. This rf carrier conveys a high data rate digitally modulated signal limited to sections of feeder cable between the cable TV broadcast channel amplifiers. In-house access to this UHF carrier signal is via the normal TV cable tap and drop cable to a SIU, located near the subscriber's TV set. The feeder cable and the passive taps used in cable TV practice have a higher cutoff frequency than the feeder amplifiers themselves. This allows passage of an UHF signal over the feeder cable.
    Type: Grant
    Filed: June 18, 1997
    Date of Patent: February 9, 1999
    Assignee: COM 21, Incorporated
    Inventor: Paul Baran
  • Patent number: 5642351
    Abstract: 53 byte ATM compliant cells transmitted over a digital optical fiber path interconnected with a coaxial feeder cable TV system supporting two-way digital services at sites connected to the TV cable system. At the point of interconnection between the fiber optic path and the cable TV feeder subsystem, digital signals are converted to a UHF rf carrier frequency above the cutoff pass-band of the analog signal feeder amplifier carrying TV broadcast signals. RF carrier conveys a high data rate digitally modulated signal limited to sections of feeder cable between the cable TV broadcast channel amplifiers. In-house access to UHF carrier signal is via the normal TV cable tap and drop cable to a SIU, located near the subscriber's TV set. Feeder cable and the passive taps used in cable TV practice have a higher cutoff frequency than the feeder amplifiers themselves. This allows passage of an UHF signal over the feeder cable.
    Type: Grant
    Filed: October 17, 1994
    Date of Patent: June 24, 1997
    Assignee: Com 21, Inc.
    Inventor: Paul Baran
  • Patent number: 5550820
    Abstract: A bi-directional communications system for bypassing a telco local exchange carrier telephone system for conveying data between at least one terminal unit and a switching unit that has the functionality of a Class 5 central telephone office switch that is connected to a public switched telephone network. The system includes a relay transceiver where the signals from the terminal units are converted bi-directionally between the signal format of the terminal units and fixed length compliant ATM cells when the signal format of the terminal units is other than a fixed length compliant ATM cell format.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: August 27, 1996
    Assignee: Com 21, Inc.
    Inventor: Paul Baran
  • Patent number: 5544164
    Abstract: The present invention is a Wide Area Network (WAN) Asynchronous Transfer Mode (ATM) compliant cell based communications system that is capable of delivering high data rate cells from a plurality of terminal devices to support a multiplicity of simultaneous terminal device applications for homes and businesses. This system provides the capability of providing voice and data communications on cable TV systems and to tie multiple cable TV systems and telcos together for transmission of voice and data communication between any combination of them.
    Type: Grant
    Filed: November 8, 1994
    Date of Patent: August 6, 1996
    Assignee: COM 21, Inc.
    Inventor: Paul Baran
  • Patent number: 5425027
    Abstract: 53 byte length ATM compliant cells are transmitted over a digital optical fiber path to interconnect with a coaxial feeder cable TV system to support two-way digital services at a plurality of sites connected to the TV cable system. At the point of interconnection between the fiber optic path and the cable TV feeder subsystem, digital signals are converted to a UHF rf carrier frequency above the cutoff pass-band of the analog signal feeder amplifier carrying TV broadcast signals. This rf carrier conveys a high data rate digitally modulated signal limited to sections of feeder cable between the cable TV broadcast channel amplifiers. In-house access to this UHF carrier signal is via the normal TV cable tap and drop cable to a SIU, located near the subscriber's TV set. The feeder cable and the passive taps used in cable TV practice have a higher cutoff frequency than the feeder amplifiers themselves. This allows passage of an UHF signal over the feeder cable.
    Type: Grant
    Filed: January 4, 1993
    Date of Patent: June 13, 1995
    Assignee: COM21, Inc.
    Inventor: Paul Baran
  • Patent number: 5421030
    Abstract: Cordless telephones generate cell relay packets. Packets from each cordless telephone are polled by an upstream polling unit avoiding multi-unit interference. Cell packets are transmitted via a cable TV system. Radiated frequencies of the cordless telephones are shifted in frequency as they enter or leave the TV feeder cable to allow frequency reuse. The upstream polling unit appends header information on the cell packets and converts them into standard SONET ATM protocol packets. The cell relay packets are switched by a cell relay type switch to create a cost-effective, alternative telephone system.
    Type: Grant
    Filed: September 17, 1991
    Date of Patent: May 30, 1995
    Assignee: Com21, Inc.
    Inventor: Paul Baran
  • Patent number: 5341415
    Abstract: A system to allow two or more telephone carriers to automatically connect to existing in-house telephone wiring wherein the choice of carrier is made by the calling party. Service is provided on a default basis by a primary carrier, however, the user can select and cause an alternative carrier to be connected to the in-house wiring permitting the use of standard telephone equipment with different carriers at the option of the calling party. In this system the switching arrangement is such that only one carrier is connected to the in-house wiring at any one time. Additionally, there is provision to detect incoming calls from carriers other than the default primary carrier and to switch to that carrier in response to the incoming call. Further, this system permits the packetization of outgoing information and the receipt of packetized incoming information on the secondary carrier with standard telephone equipment that is connected to the in-house wiring.
    Type: Grant
    Filed: September 22, 1992
    Date of Patent: August 23, 1994
    Inventor: Paul Baran
  • Patent number: 5338332
    Abstract: The present invention is an isothermal current shunt device with excellent temperature coefficient of resistivity characteristics stability for use in a power measuring circuit having a wide temperature and dynamic range and particularly for customers of electric utility companies, and it includes a first arm having a first flange portion, a second arm having a second flange portion, and a bridge means coupling the first arm to the second arm wherein the bridge means is a monolithic sintered powdered-metal piece having a block portion and a loop portion. The block portion has a first face juxtaposed to and electrically coupled to the first flange portion of the first arm and a second opposing face juxtaposed to and electrically coupled to the second flange portion of the second arm. This configuration allows a majority of electrical current to conduct between the first arm and the second arm.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: August 16, 1994
    Assignee: Metricom, Inc.
    Inventors: Paul Baran, Ronald S. Palmer
  • Patent number: 5247591
    Abstract: The present invention includes an open-ended set of cover sheet forms that may be readily interpreted by the fax server system. In this system a first standardized cover sheet is designed to accept hand printed characters. This first cover sheet is then transmitted to a special fax server as part of this invention to create an alternative, fully detached cover sheet for automatic transmission to its specific recipient. Labor is minimized by allowing the sender to hand print a minimal amount of highly constrained telephone numbers, or the initials of the recipient onto a draft cover sheet when a mailing list has been previously stored in the memory associated with the special fax server.
    Type: Grant
    Filed: October 10, 1990
    Date of Patent: September 21, 1993
    Assignee: Interfax, Inc.
    Inventor: Paul Baran
  • Patent number: 5223790
    Abstract: An isothermal current shunt device with excellent temperature coefficient of resistivity characteristics stability for use in a power measuring circuit having a wide temperature and dynamic range and particularly for customers of electric utility companies, and it includes a first arm having a first flange portion, a second arm having a second flange portion, and a bridge means coupling the first arm to the second arm wherein the bridge means is a monolithic sintered powdered-metal piece having a block portion and a loop portion. The block portion has a first face juxtaposed to and electrically coupled to the first flange portion of the first arm and a second opposing face juxtaposed to and electrically coupled to the second flange portion of the second arm. This configuration allows a majority of electrical current to conduct between the first arm and the second arm. The loop portion is outside the first face and the second face of the block portion and conducts a minority of current.
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: June 29, 1993
    Assignee: Metricom, Inc.
    Inventors: Paul Baran, Ronald S. Palmer
  • Patent number: 5115433
    Abstract: A packet network routing method and system based on geographic coordinate identifiers is described. Each node in a network is uniquely identified by absolute geographical coordinates or by a code indicating absolute location in an external coordinate-based reference system (node coordinates), and such absolute geographical coordinates or the equivalent are employed as part of a packet identifier for each packet generated for use in making routing decisions. The node coordinates of a local node and its neighboring nodes and the packet coordinates are used by means at each node through which a packet is routed for determining a desired forwarding route of a data packet. The routing may be prioritized according to preselected criteria, preferably achieving maximum forward progress using the least amount of power. The packet routing protocol according to the invention requires no routing directory or table to perform data routing.
    Type: Grant
    Filed: April 20, 1990
    Date of Patent: May 19, 1992
    Assignee: Metricom, Inc.
    Inventors: Paul Baran, George H. Flammer, III, Robert L. Kalkwarf
  • Patent number: RE34429
    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: January 7, 1992
    Date of Patent: November 2, 1993
    Inventors: Paul Baran, David F. Baran