Patents by Inventor Timothy J. Hughes
Timothy J. Hughes 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: 7796714Abstract: In one aspect, the invention is a multichannel receiver. The multichannel receiver includes a first channel circuit of N channel circuits. The first channel circuit includes a band pass (BP) filter and a gain control (GC) feedback circuit configured to adjust a signal provided by the BP filter with respect to a reference voltage.Type: GrantFiled: August 2, 2006Date of Patent: September 14, 2010Assignee: Powerwave Cognition, Inc.Inventors: Rita R. Rabbath, Terry E. Flach, James S. Tsusaki, Timothy J. Hughes, Kurt I. Winckler
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Publication number: 20090122766Abstract: In a Mobile Ad Hoc Network (MANET), nested weighted round robin queues are employed to selectively provide channel access for traffic according to a priority or Quality of Service (QoS) for data. By nesting queues within other queues, and applying a weighted round robin technique to serve each queue, relatively arbitrary service metrics may be achieved including nodal QoS for class-based traffic, avoidance of queue starvation, and so forth. Prioritized queues may also be provided for preemptive delivery of high priority traffic.Type: ApplicationFiled: September 30, 2008Publication date: May 14, 2009Inventors: Timothy J. Hughes, Wendell Y. Kishaba, Marina Gurevich, Arthur E. Anderson, Tyler J. Ulinskas
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Publication number: 20090122753Abstract: In a Mobile Ad Hoc Network (MANET), Dynamic Data Link Segmentation and Reassembly (SAR) functions perform a large packet to small packet transformation and reassembles packets at a receiving node. The packet size is determined dynamically in response to link quality data for each individual data link. By periodically sharing link quality information with neighbors, the segmentation size and corresponding reassembly can be performed using readily available neighborhood and waveform information.Type: ApplicationFiled: September 30, 2008Publication date: May 14, 2009Inventors: Timothy J. Hughes, Daniel R. Cormier, Tyler J. Ulinskas
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Publication number: 20090116393Abstract: In a Mobile Ad Hoc Network (MANET), multi-metric information is gathered and applied to a cost-based route calculation. In particular, each node gathers resource metrics from neighboring of nodes, along with data rate and reliability information for data links to and from the node. This information is applied to a costing algorithm such as Dykstra' Open Shortest Path First algorithm to obtain routes through the network. This approach may be adapted with suitable modifications to use with unicast traffic or with a multicast forwarding group.Type: ApplicationFiled: September 30, 2008Publication date: May 7, 2009Inventors: Timothy J. Hughes, Wendell Y. Kishaba, Chau T. Trinh
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Publication number: 20090116511Abstract: In a Mobile Ad Hoc Network (MANET), each node calculates a bandwidth output value representative of data output requirements for the node relative to the transmit time slots available to the node. This value is shared with other nodes in the MANET and may be employed to more efficiently allocate channel usage among nodes as traffic demands and network topology change.Type: ApplicationFiled: September 30, 2008Publication date: May 7, 2009Inventors: Arthur E. Anderson, Wendell Y. Kishaba, Timothy J. Hughes
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Publication number: 20090086752Abstract: In one aspect, a method to schedule network communications in a network having nodes connected by links includes sending a bandwidth value of a first node for each link connected to the first node to neighbors of the first node, receiving bandwidth values from the neighbors of the first node; and determining node weight values of the first node and the neighbors of the first node based on the bandwidth values received from the neighbors of the first node and the bandwidth value of the first node. The method also includes sending the node weight values of the first node to the neighbors of the first node, receiving the node weight values from the neighbors of the first node, determining access values for each node based on a fair access technique and determining network scheduling based on the access values and the node weight values.Type: ApplicationFiled: November 30, 2007Publication date: April 2, 2009Inventors: Arthur E. Anderson, Wendell Y. Kishaba, Timothy J. Hughes
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Publication number: 20080031388Abstract: In one aspect, the invention is a multichannel receiver. The multichannel receiver includes a first channel circuit of N channel circuits. The first channel circuit includes a band pass (BP) filter and a gain control (GC) feedback circuit configured to adjust a signal provided by the BP filter with respect to a reference voltage.Type: ApplicationFiled: August 2, 2006Publication date: February 7, 2008Inventors: Rita R. Rabbath, Terry E. Flach, James S. Tsusaki, Timothy J. Hughes, Kurt I. Winckler
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Patent number: 7160258Abstract: A device and method for mapping, diagnosing and treating the intestinal tract is provided using a capsule passing through the intestinal tract. Further, a capsule tracking system is provided for tracking a capsule's location along the length of an intestinal tract as various treatment and/or sensing modalities are employed. In one variation, an acoustic signal is used to determine the location of the capsule. A map of sensed information may be derived from the pass of a capsule. Capsules may be subsequently passed through to treat the intestinal tract at a determined location along its length. One variation uses an electrical stimulation capsule to treat and/or diagnose a condition in the intestinal tract.Type: GrantFiled: June 26, 2001Date of Patent: January 9, 2007Assignee: Entrack, Inc.Inventors: Mir A. Imran, Olivier K. Colliou, Ted W. Layman, Sharon L. Lake, Harm TenHoff, Timothy J. Hughes
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Publication number: 20040068204Abstract: A device and method for mapping, diagnosing and treating the intestinal tract is provided using a capsule passing through the intestinal tract. Further, a capsule tracking system is provided for tracking a capsule's location along the length of an intestinal tract as various treatment and/or sensing modalities are employed. In one variation, an acoustic signal is used to determine the location of the capsule. A map of sensed information may be derived from the pass of a capsule. Capsules may be subsequently passed through to treat the intestinal tract at a determined location along its length. One variation uses an electrical stimulation capsule to treat and/or diagnose a condition in the intestinal tract.Type: ApplicationFiled: May 1, 2003Publication date: April 8, 2004Inventors: Mir A. Imran, Olivier K. Colliou, Ted W. Layman, Sharon L. Lake, Harm TenHoff, Timothy J. Hughes
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Publication number: 20020198470Abstract: A device and method for mapping, diagnosing and treating the intestinal tract is provided using a capsule passing through the intestinal tract. Further, a capsule tracking system is provided for tracking a capsule's location along the length of an intestinal tract as various treatment and/or sensing modalities are employed. In one variation, an acoustic signal is used to determine the location of the capsule. A map of sensed information may be derived from the pass of a capsule. Capsules may be subsequently passed through to treat the intestinal tract at a determined location along its length. One variation uses an electrical stimulation capsule to treat and/or diagnose a condition in the intestinal tract.Type: ApplicationFiled: June 26, 2001Publication date: December 26, 2002Inventors: Mir A. Imran, Olivier K. Colliou, Ted W. Layman, Sharon L. Lake, Harm TenHoff, Timothy J. Hughes
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Patent number: 5634720Abstract: A multi-lumen, multi-purpose cardiac catheter which incorporates optical filaments and an optical coupler for use with external apparatus for determining the oxygen concentration in the blood of a patient under critical care conditions, as well as incorporating therein a thermal element useable with a second external apparatus for measurement of continuous cardiac output. A thermal plug provides an interface between a temperature control apparatus and the thermal element to simply and accurately monitor and control the temperature of the thermal element. A temperature monitoring circuit in the thermal plug facilitates temperature measurement at the thermal element. The catheter also includes a thermistor and at least one injectate port for enabling the user to also conduct thermal dilution readings and obtain intermittent measurements of cardiac output. The combination of a thermal dilution catheter with a SV0.sub.Type: GrantFiled: September 2, 1994Date of Patent: June 3, 1997Assignee: Abbott LaboratoriesInventors: David A. Gallup, Timothy J. Hughes
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Patent number: 5620002Abstract: A method and apparatus for correcting thermal drift in cardiac output measurements based upon a temperature signal indicative of the change in temperature of blood leaving the heart is disclosed. In a first preferred embodiment of a cardiac output monitoring system (10), the catheter (14) is provided with an electrical resistance heater (22). An electrical current having a sinusoidal waveform with a period of from 30 to 60 seconds is applied to the heater, causing power to be dissipated into the blood within a patient's heart (12). A temperature sensor (24) disposed near a distal end of the catheter produces a signal indicative of the temperature of blood leaving the heart. The temperature signal and the signal corresponding to the electrical power dissipated in the heater (an input signal) are filtered at a frequency .omega.n corresponding to the frequency of the applied electrical current, i.e., the frequency of the input signal.Type: GrantFiled: December 22, 1995Date of Patent: April 15, 1997Assignee: Abbott Critical Care SystemsInventor: Timothy J. Hughes
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Patent number: 5611338Abstract: A multi-lumen, multi-purpose cardiac catheter which incorporates optical filaments and an optical coupler for use with external apparatus for determining the oxygen concentration in the blood of a patient under critical care conditions, as well as incorporating therein a thermal element useable with a second external apparatus for measurement of continuous cardiac output. The thermal element is disposed at a necked down portion of the catheter at the distal end thereof, with at least one of the lumens of the catheter substantially compressed at the necked down portion thereof. The catheter also includes a thermistor and at least one injectate port for enabling the user to also conduct thermal dilution readings and obtain intermittent measurements of cardiac output. The combination of a thermal dilution catheter with a SVO.sub.Type: GrantFiled: September 29, 1994Date of Patent: March 18, 1997Assignee: Abbott LaboratoriesInventors: David A. Gallup, John M. Sperinde, William A. Ambrisco, Timothy J. Hughes, Anthony J. Pantages, Jeffrey A. Sarge, Scott T. Tsuchitani
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Patent number: 5474080Abstract: A method of using a heated catheter for monitoring cardiac output. Displaced from a distal end of a heated catheter (30) is a resistive heater (39) that heats blood flowing within a heart muscle (10). The resistive heater is mounted on the catheter so that when the catheter is inserted into the heart, the resistive heater is disposed in the right ventricle. A temperature sensor (34) is disposed downstream of the resistive heater, in or proximate the pulmonary artery during use. The temperature of the resistive heater is monitored using the temperature sensor to prevent the temperature from exceeding a predetermined level. A differential amplifier (40, 70) provides an electrical current to the resistive heater that varies as a function of the difference between the temperature of the resistive heater, measured by a temperature sensor (35), and a predetermined temperature. In another embodiment of the invention, a resistive heater (90) has a resistance that varies with temperature.Type: GrantFiled: October 8, 1993Date of Patent: December 12, 1995Assignee: Abbott LaboratoriesInventor: Timothy J. Hughes
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Patent number: 5435308Abstract: A multi-lumen, multi-purpose cardiac catheter which incorporates optical filaments and an optical coupler for use with external apparatus for determining the oxygen concentration in the blood of a patient under critical care conditions, as well as incorporating therein a heater coil useable with a second external apparatus for measurement of continuous cardiac output. The catheter also includes a thermistor and at least one injectate port for enabling the user to also conduct thermal dilution readings and obtain intermittent measurements of cardiac output. The combination of a thermal dilution catheter with a SVO.sub.2 catheter and a continuous cardiac output catheter gives the multi-purpose catheter above described substantial versatility as well as providing the user with a versatile cardiac catheter device which enables him to conduct multiple evaluations of disparate blood-related parameters which require the use of separate apparatus.Type: GrantFiled: July 16, 1992Date of Patent: July 25, 1995Assignee: Abbott LaboratoriesInventors: David A. Gallup, Timothy J. Hughes, John Sperinde
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Patent number: 5363856Abstract: A method and apparatus for correcting thermal drift in cardiac output measurements based upon a temperature signal indicative of the change in temperature of blood leaving the heart is disclosed. In a first preferred embodiment of a cardiac output monitoring system(10), the catheter(14) is provided with an electrical resistance heater (22). An electrical current having a sinusoidal waveform with a period of from 30 to 60 seconds is applied to the heater, causing power to be dissipated into the blood within a patient's heart (12). A temperature sensor (24) disposed near a distal end of the catheter produces a signal indicative of the temperature of blood leaving the heart. The temperature signal and the signal corresponding to the electrical power dissipated in the heater (an input signal) are filtered at a frequency .omega. corresponding to the frequency of the applied electrical current, i.e., the frequency of the input signal.Type: GrantFiled: August 13, 1993Date of Patent: November 15, 1994Assignee: Abbott LaboratoriesInventors: Timothy J. Hughes, David N. Swingler
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Patent number: 5322689Abstract: The present invention relates to topical aromatic releasing compositions substantially free from petrolatum and containing one or more volatile aromatic compounds selected from the group consisting of menthol, camphor and eucalyptus oil and mixtures thereof. In further embodiments, these compositions contain one or more topical actives, and are also useful for providing relief from symptoms associated with respiratory disorders.Type: GrantFiled: March 10, 1992Date of Patent: June 21, 1994Assignee: The Procter & Gamble CompanyInventors: Timothy J. Hughes, George E. Deckner
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Patent number: 5285796Abstract: A method and apparatus for continuously monitoring cardiac output based upon the phase shift between an input signal and a temperature signal indicative of the change in temperature of blood leaving the heart. In a first preferred embodiment of a cardiac output monitoring system (10), a catheter (14) is provided with an electrical resistance heater (22). An electrical current having a sinusoidal wave form with a period of from 30 to 60 seconds is applied to the heater, causing power to be dissipated into the blood within a patient's heart (12). A temperature sensor (24) disposed near a distal end of the catheter produces a signal indicative of the temperature of blood leaving the heart. The temperature signal and the signal corresponding to the electrical power dissipated in the heater (an input signal) are filtered at a frequency .omega. corresponding to the frequency of the applied electrical current, i.e., the frequency of the input signal.Type: GrantFiled: March 10, 1993Date of Patent: February 15, 1994Assignee: Abbott LaboratoriesInventor: Timothy J. Hughes
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Patent number: 5277191Abstract: A heated catheter for monitoring cardiac output. Displaced from a distal end of a heated catheter (30) is a resistive heater (32) that heats blood flowing within a heart muscle (10). The resistive heater is mounted on the catheter so that when the catheter is inserted into the heart, the resistive heater is disposed in the right ventricle. A temperature sensor (34) is disposed downstream of the resistive heater, in or proximate the pulmonary artery during use. A differential amplifier (40, 70) provides an electrical current to the resistive heater that varies as a function of the difference between the temperature of the resistive heater, measured by a temperature sensor (35), and a predetermined temperature. In another embodiment of the invention, a resistive heater (90) has a resistance that varies with temperature. The resistive heater comprises one arm of a bridge circuit (85).Type: GrantFiled: June 19, 1991Date of Patent: January 11, 1994Assignee: Abbott LaboratoriesInventor: Timothy J. Hughes
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Patent number: 5261411Abstract: A method for compensating the determination of cardiac output for a baseline blood temperature drift, or other long-term noise. The method is applicable to the continuous monitoring of cardiac output, which is carried out by modifying the temperature of blood within a heart (12) using a periodically varying electrical current that is applied to a heater (22) disposed on the outer surface of a catheter (14) inserted within the heart. A temperature sensor (24) disposed near a distal end (18) of the catheter monitors the temperature of blood leaving the heart, producing a blood temperature signal that periodically varies in a manner corresponding to the input signal. Alternatively, the temperature of blood within the heart can be modified by heat exchange with a fluid circulated within a heat exchanger (16) on the catheter, so that heat is transferred between the fluid and blood.Type: GrantFiled: December 27, 1991Date of Patent: November 16, 1993Assignee: Abbott LaboratoriesInventor: Timothy J. Hughes