Patents by Inventor Thomas C. Hogan
Thomas C. Hogan 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).
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Patent number: 8541961Abstract: The present invention is directed to an electron beam crossbar switch for interconnection between communication units. The crossbar switch includes an array of electrically charged particle emitter source devices with an input connected to a slow wave structure coupled to the emitter source. An array of detectors is positioned relative to the array of emitter devices for receiving charged particles from various of the emitter devices. X and y deflection means are positioned adjacent each of the emitters for directing the charged particles from each of the emitters to at least one of the detectors to provide more signal output and a reduction in deflection accuracy.Type: GrantFiled: February 14, 2012Date of Patent: September 24, 2013Assignee: Hewlett-Packard Development Company, L.P.Inventor: Thomas C. Hogan
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Publication number: 20120141127Abstract: The present invention is directed to an electron beam crossbar switch for interconnection between communication units. The crossbar switch includes an array of electrically charged particle emitter source devices with an input connected to a slow wave structure coupled to the emitter source. An array of detectors is positioned relative to the array of emitter devices for receiving charged particles from various of the emitter devices. X and y deflection means are positioned adjacent each of the emitters for directing the charged particles from each of the emitters to at least one of the detectors to provide more signal output and a reduction in deflection accuracy.Type: ApplicationFiled: February 14, 2012Publication date: June 7, 2012Inventor: Thomas C. Hogan
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Patent number: 8138838Abstract: The present invention is directed to an electron beam crossbar switch for interconnection between communication units. The crossbar switch includes an array of electrically charged particle emitter source devices with an input connected to a slow wave structure coupled to the emitter source. An array of detectors is positioned relative to the array of emitter devices for receiving charged particles from various of the emitter devices. X and y deflection means are positioned adjacent each of the emitters for directing the charged particles from each of the emitters to at least one of the detectors to provide more signal output and a reduction in deflection accuracy.Type: GrantFiled: August 1, 2008Date of Patent: March 20, 2012Assignee: Hewlett-Packard Development Company, L.P.Inventor: Thomas C. Hogan
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Publication number: 20100012865Abstract: The present invention is directed to an electron beam crossbar switch for interconnection between communication units. The crossbar switch includes an array of electrically charged particle emitter source devices with an input connected to a slow wave structure coupled to the emitter source. An array of detectors is positioned relative to the array of emitter devices for receiving charged particles from various of the emitter devices. X and y deflection means are positioned adjacent each of the emitters for directing the charged particles from each of the emitters to at least one of the detectors to provide more signal output and a reduction in deflection accuracy.Type: ApplicationFiled: August 1, 2008Publication date: January 21, 2010Applicant: 3Com CorporationInventor: Thomas C. Hogan
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Patent number: 5535337Abstract: A token ring concentrator port circuit including an upstream data node, a downstream data node, a station receiver node, a station transmitter node, a path switch configured to selectively either connect the upstream data node directly to the downstream data node or connect the station receiver and transmitter nodes between the upstream and downstream data nodes, and a timing recovery circuit including a phase locked loop that derives a recovered clock from data from a station connected to the station receiver and transmitter nodes and reclocks the data with the recovered clock before transmitting the data to the downstream data node, the phase locked loop including a constant gain phase detector, the timing recovery circuit including a frequency limiting circuit, the port circuit components being implemented in a common integrated circuit.Type: GrantFiled: December 22, 1992Date of Patent: July 9, 1996Assignee: 3COM CorporationInventors: Thomas C. Hogan, Peter K. Williams
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Patent number: 4639936Abstract: The invention features a method and apparatus for improving data transmission in a transmission system having an analog signal transmitter directly connected along a transmission link to an analog signal receiver having a threshold element for detecting the signal. The invention features clamping voltages appearing at an input of the receiver symmetrically about a threshold value of the threshold element.Type: GrantFiled: February 10, 1984Date of Patent: January 27, 1987Assignee: Prime Computer, Inc.Inventors: Thomas C. Hogan, Arnold Adelman
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Patent number: 4594724Abstract: An apparatus and method, for connecting a node to and disconnecting a node from a high speed data communications network, has a dead man switching element and high speed solid state switching circuitry interconnected therewith to avoid the effects of mechanical contact bounce normally associated with operation of the mechanical switching element. Thereby, massive data losses on high speed communications paths, and token loss in a token-passing ring network, are substantially avoided. The switch has the solid state switching circuitry connected both in parallel and in series with its mechanical contacts for providing node isolation and communications path bypass channels during the time that the mechanical switch bounce occurs. The alternate paths are maintained during a change of state of the mechanical device, that is, when the node is being connected or disconnected from the communications network.Type: GrantFiled: February 10, 1984Date of Patent: June 10, 1986Assignee: Prime Computer, Inc.Inventor: Thomas C. Hogan
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Patent number: 4536876Abstract: A communications network including a plurality of terminals coupled together to provide a unidirectional communications ring. Each of the terminals is coupled in series along the ring. Each terminal is adapted to transmit (at an associated data rate) a digital signal to the next downstream terminal on the ring. Each terminal is adapted to receive a digital signal at the data rate associated with the next upstream terminal. The received digital signal is applied to a phase locked loop characterized by a hold time which exceeds its lock time. The phase locked loop extracts a local timing signal for re-clocking the received digital signal. The transmission time of N bits is less than the hold time of the phase locked loop. Each terminal monitors the re-clocked signal to identify when same valued consecutive bits are received for a period less than the phase locked loop hold time, and upon such detection to cause that terminal to generate at least one transition.Type: GrantFiled: February 10, 1984Date of Patent: August 20, 1985Assignee: Prime Computer, Inc.Inventors: Richard G. Bahr, Thomas C. Hogan
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Patent number: 4528661Abstract: A communications network including a plurality of terminals coupled together to provide a unidirectional communications ring. Each of the terminals is adapted to transmit (at an associated fixed data rate) a digital signal to the next downstream terminal on the ring. Each terminal is adapted to receive a digital signal at the data rate associated with the next upstream terminal. In each local terminal, there is a detector for detecting the received synchronization packets and associated data packets are generated for transmission to the next downstream terminal on the ring at a predetermined fixed data rate associated with the local terminal. The data of each transmitted data packet matches bit for bit the data of the corresponding received data packet.Type: GrantFiled: February 14, 1983Date of Patent: July 9, 1985Assignee: Prime Computer, Inc.Inventors: Richard G. Bahr, Thomas C. Hogan