Patents by Inventor William Loh
William Loh 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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Publication number: 20100191026Abstract: An ashless lubricating oil, comprising a base oil having a viscosity index greater than 150, wherein the base oil is made from a blend of petroleum-based wax and Fischer-Tropsch derived wax.Type: ApplicationFiled: December 23, 2009Publication date: July 29, 2010Inventors: William Loh, John M. Rosenbaum, Nancy J. Bertrand, Patricia LeMay, Mark E. Okazaki
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Publication number: 20100100859Abstract: A design methodology which prevents functional failure caused by CDM ESD events. A transistor model is used to model the final states of cells, and a simulator is then used to identify invulnerable cells. Cells that are potential failure sites are then identified. The cells which have been identified as being potential victims are replaced by the previously-identified invulnerable cells that have the identical logic function. On the other hand, if a cell with identical function cannot be found, an invulnerable buffer cell (that will not effect logic function) can be inserted in front of the potential victim transistor as protection. By replacing all the potential victim cells with cells which have been determined to be invulnerable, the resulting design will be guaranteed to be CDM ESD tolerant.Type: ApplicationFiled: October 21, 2008Publication date: April 22, 2010Applicant: LSI CORPORATIONInventors: Choshu Ito, Tze Wee Chen, William Loh
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Patent number: 7674364Abstract: A hydraulic fluid composition having excellent seal compatibility is prepared from an isomerized base oil is provided. The composition comprising (i) 80 to 99.999 wt. % of a lubricating base oil having consecutive numbers of carbon atoms, less than 10 wt % naphthenic carbon by n-d-M, less than 0.10 wt. % olefins and less than 0.05 wt. % aromatics, a molecular weight of greater than 600 by ASTM D 2503-92 (Reapproved 2002), a wt % total molecules with cycloparaffinic functionality greater than 25 and a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 10; and (ii) optionally from 0.001 to 6 wt % of a viscosity modifier; and (iii) 0-10 wt % of at least an additive package. When used in operations, the composition results in an average volume change in a rubber seal of less than 3% and an average hardness change in the rubber seal of less than 1 pts. when tested under ASTM D 471-06 (SRE NBR1 at 100° C., 168 hours).Type: GrantFiled: August 28, 2007Date of Patent: March 9, 2010Assignee: Chevron U.S.A. Inc.Inventors: William Loh, John M. Rosenbaum, Nancy J. Bertrand, Patricia V. Lemay
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Patent number: 7662271Abstract: A lubricating oil (made from Group III base oil having a sequential number of carbon atoms) having a VI between 155 and 300, a RPVOT greater than 680 minutes, and a kinematic viscosity at 40° C. from 19.8 cSt to 748 cSt. A lubricating oil having a high VI and high RPVOT comprising: a) a Group III base oil with a sequential number of carbon atoms, and defined cycloparaffin composition or low traction coefficient, b) an antioxidant additive concentrate and c) no VI improver. A process comprising: a) hydroisomerization dewaxing of a waxy feed, b) fractionating the produced base oil, c) selecting a fraction having a VI greater than 150, and a high level of molecules with cycloparaffinic functionality or a low traction coefficient, and d) blending the fraction with an antioxidant additive concentrate. Also, a method of improving the oxidation stability of a lubricating oil.Type: GrantFiled: December 21, 2005Date of Patent: February 16, 2010Assignee: Chevron U.S.A. Inc.Inventors: William Loh, John Rosenbaum, Nancy J. Bertrand, Patricia Lemay, Rawls Frazier, Mark E. Okazaki
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Patent number: 7656340Abstract: Various embodiments of the present invention provide systems and methods for analog to digital conversion. For example, a pipelined analog to digital converter is disclosed that includes two or more comparators. A first of the comparators is operable to compare an analog input to a first voltage reference upon assertion of the first clock, and a second of the comparators is operable to compare the analog input to a second voltage reference upon assertion of the second clock. The pipelined analog to digital converters further include a multiplexer tree with at least a first tier multiplexer and a second tier multiplexer. The first tier multiplexer receives an output of the first comparator and an output of the second comparator, and the second tier multiplexer receives an output derived from the first tier multiplexer. The second tier multiplexer provides an output bit.Type: GrantFiled: June 6, 2008Date of Patent: February 2, 2010Assignee: LSI CorporationInventors: Sergey Gribok, Choshu Ito, William Loh, Erik Chmelar
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Patent number: 7655133Abstract: An ashless lubricating oil, comprising a base oil having greater than 90 wt % saturates, less than 10 wt % aromatics, a viscosity index greater than 130, low sulfur, and a sequential number of carbon atoms. The lubricating oil has a VI between 155 and 300, greater than 680 minutes in a rotary pressure vessel oxidation test, and a kinematic viscosity at 40° C. from 19.8 to 748 cSt. An ashless paper machine oil, comprising a base oil having a sequential number of carbon atoms, wherein the oil has a defined viscosity index and high oxidation stability. Also, an ashless lubricating oil, comprising a base oil having a viscosity index greater than 150, wherein the base oil is made from a blend of petroleum-based wax and Fischer-Tropsch derived wax.Type: GrantFiled: November 25, 2008Date of Patent: February 2, 2010Assignee: Chevron U.S.A. Inc.Inventors: William Loh, John M. Rosenbaum, Nancy J. Bertrand, Patricia LeMay, Rawls H. Frazier, Mark E. Okazaki
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Patent number: 7651985Abstract: A method for improving the oxidation stability of an ashless hydraulic fluid or an ashless paper machine oil, comprising: a. selecting a base oil having greater than 90 wt % saturates, less than 10 wt % aromatics, a base oil viscosity index greater than 120, less than 0.03 wt % sulfur, a sequential number of carbon atoms, greater than 35 wt % total molecules with cycloparaffinic functionality, and a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 2.1; and b. replacing a portion of an original base oil in the ashless oil with the selected base oil to produce an improved ashless lubricating oil; wherein the improved ashless lubricating oil has a result in the rotary pressure vessel oxidation test that is at least 50 minutes greater than the result in the rotary pressure oxidation test of the ashless hydraulic fluid or ashless paper machine oil.Type: GrantFiled: August 6, 2008Date of Patent: January 26, 2010Assignee: Chevron U.S.A. Inc.Inventors: William Loh, John M. Rosenbaum, Nancy J. Bertrand, Patricia LeMay, Rawls Frazier, Mark E. Okazaki
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Publication number: 20090319251Abstract: A method for simulating a response of a circuit to an ESD input stimulus applied to the circuit includes the steps of: receiving a description of the circuit into a circuit simulation program, the circuit including at least one mutual inductance element indicative of magnetic coupling in the circuit; generating a linear approximation of nonlinear elements in the circuit at respective DC bias points of the nonlinear elements; obtaining a frequency domain transfer function of the circuit; obtaining a time domain impulse response of the circuit as a function of the frequency domain transfer function; integrating the time domain impulse response to yield a step response of the circuit, the step response being indicative of a response of the circuit to the ESD input stimulus; and analyzing the step response of the circuit to determine whether the circuit will operate within prescribed parameters corresponding to the circuit.Type: ApplicationFiled: June 23, 2008Publication date: December 24, 2009Inventors: Choshu Ito, William Loh
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Publication number: 20090303093Abstract: Various embodiments of the present invention provide systems and methods for analog to digital conversion. For example, a pipelined analog to digital converter is disclosed that includes two or more comparators. A first of the comparators is operable to compare an analog input to a first voltage reference upon assertion of the first clock, and a second of the comparators is operable to compare the analog input to a second voltage reference upon assertion of the second clock. The pipelined analog to digital converters further include a multiplexer tree with at least a first tier multiplexer and a second tier multiplexer. The first tier multiplexer receives an output of the first comparator and an output of the second comparator, and the second tier multiplexer receives an output derived from the first tier multiplexer. The second tier multiplexer provides an output bit.Type: ApplicationFiled: June 6, 2008Publication date: December 10, 2009Inventors: Sergey Gribok, Choshu Ito, William Loh, Erik Chmelar
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Publication number: 20090304066Abstract: Various embodiments of the present invention provide systems and methods for signal equalization, and in some cases analog to digital conversion. For example, an analog to digital converter is disclosed that includes a comparator bank that receives a reference indicator and is operable to provide a decision output based at least in part on a comparison of an analog input with a reference threshold corresponding to the reference indicator. A range selection filter is included that has a first adjustment calculation circuit and a second adjustment calculation circuit. The first adjustment calculation circuit is operable to calculate a first adjustment feedback value based at least in part on a speculation that the decision output is a first logic level, and the second adjustment calculation circuit is operable to calculate a second adjustment feedback value based at least in part on a speculation that the decision output is a second logic level.Type: ApplicationFiled: June 6, 2008Publication date: December 10, 2009Inventors: Erik Chmelar, Choshu Ito, William Loh
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Publication number: 20090296292Abstract: An ESD protection circuit for protecting a host circuit coupled to a signal pad from an ESD event occurring at the signal pad includes at least one MEMS switch which is electrically connected to the signal pad. The MEMS switch includes a first contact structure adapted for connection to the signal pad, and a second contact structure adapted for connection to a voltage supply source. The first and second contact structures are coupled together during the ESD event for shunting an ESD current from the signal pad to the voltage supply source. The first and second contact structures are electrically isolated from one another in the absence of the ESD event. At least one of the first and second contact structures includes a passivation layer for reducing contact adhesion between the first and second contact structures.Type: ApplicationFiled: May 28, 2008Publication date: December 3, 2009Inventors: Tze Wee Chen, William Loh, Choshu Ito
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Patent number: 7569524Abstract: A process for making an ashless hydraulic fluid or paper machine oil comprising a) hydroisomerization dewaxing, b) fractionating, c) selecting a fraction having a very high VI, and a high level of molecules with cycloparaffinic functionality, and d) blending the fraction with an ashless antioxidant. A process for making ashless paper machine oil, comprising: a. selecting two lubricating base oils both having a consecutive number of carbon atoms, greater than 35 wt % total molecules with cycloparaffinic functionality, and a viscosity index greater than 150; b. blending the two lubricating base oils with an ashless antioxidant additive concentrate and no viscosity index improver to make an ashless paper machine oil; wherein the ashless paper machine oil has a result of greater than 680 minutes in the rotary pressure vessel oxidation test.Type: GrantFiled: August 6, 2008Date of Patent: August 4, 2009Assignee: Chevron U.S.A. Inc.Inventors: William Loh, John M. Rosenbaum, Nancy J. Bertrand, Patricia LeMay, Rawls Frazier, Mark E. Okazaki
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Patent number: 7547666Abstract: An ashless hydraulic fluid or paper machine oil having a VI between 155 and 300, a RPVOT greater than 680 minutes, and a kinematic viscosity at 40° C. from 19.8 cSt to 748 cSt. An ashless hydraulic fluid or paper machine oil having a high VI and high RPVOT comprising: a) a Group III base oil with a sequential number of carbon atoms, and defined cycloparaffin composition or low traction coefficient, b) an ashless antioxidant additive concentrate, and c) low amount of VI improver. A process for making an ashless hydraulic fluid or paper machine oil comprising a) hydroisomerization dewaxing, b) fractionating, c) selecting a fraction having a very high VI, and a high level of molecules with cycloparaffinic functionality or a low traction coefficient, and d) blending the fraction with an ashless antioxidant. Also, a method of improving the oxidation stability of an ashless hydraulic fluid or paper machine oil.Type: GrantFiled: December 21, 2005Date of Patent: June 16, 2009Assignee: Chevron U.S.A. Inc.Inventors: William Loh, John Rosenbaum, Nancy J. Bertrand, Patricia LeMay, Rawls Frazier, Mark E. Okazaki
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Publication number: 20090075850Abstract: An ashless lubricating oil, comprising a base oil having greater than 90 wt % saturates, less than 10 wt % aromatics, a viscosity index greater than 130, low sulfur, and a sequential number of carbon atoms. The lubricating oil has a VI between 155 and 300, greater than 680 minutes in a rotary pressure vessel oxidation test, and a kinematic viscosity at 40° C. from 19.8 to 748 cSt. An ashless paper machine oil, comprising a base oil having a sequential number of carbon atoms, wherein the oil has a defined viscosity index and high oxidation stability. Also, an ashless lubricating oil, comprising a base oil having a viscosity index greater than 150, wherein the base oil is made from a blend of petroleum-based wax and Fischer-Tropsch derived wax.Type: ApplicationFiled: November 25, 2008Publication date: March 19, 2009Inventors: William Loh, John Rosenbaum, Nancy J. Bertrand, Patricia LeMay, Rawls Frazier, Mark E. Okazaki
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Patent number: 7493576Abstract: Methods and structure for improved design remediation for previously inexplicable damage to core circuits of an application circuit design caused by CDM ESD events. Features and aspects hereof note that such previously inexplicable damage to core circuits of an application circuit design is caused by inductive coupling between the non-core circuits and the core circuits of an application circuit design. Features and aspects hereof automatically alter an application circuit design to provide remediation by various techniques to reduce the magnitude of such inductive coupling and to thereby reduce susceptibility of the application circuit to damage from CDM ESD events. The modifications may be enforced as rules during initial design of the application circuit or as reconfiguration of a design in response to simulation to discover inappropriate coupling in the design.Type: GrantFiled: February 7, 2006Date of Patent: February 17, 2009Assignee: LSI CorporationInventors: William Loh, Li Lynn Ooi, Choshu Ito
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Publication number: 20090029882Abstract: A process for making an ashless hydraulic fluid or paper machine oil comprising a) hydroisomerization dewaxing, b) fractionating, c) selecting a fraction having a very high VI, and a high level of molecules with cycloparaffinic functionality, and d) blending the fraction with an ashless antioxidant. A process for making ashless paper machine oil, comprising: a. selecting two lubricating base oils both having a consecutive number of carbon atoms, greater than 35 wt % total molecules with cycloparaffinic functionality, and a viscosity index greater than 150; b. blending the two lubricating base oils with an ashless antioxidant additive concentrate and no viscosity index improver to make an ashless paper machine oil; wherein the ashless paper machine oil has a result of greater than 680 minutes in the rotary pressure vessel oxidation test.Type: ApplicationFiled: August 6, 2008Publication date: January 29, 2009Inventors: William Loh, John M. Rosenbaum, Nancy J. Bertrand, Patricia LeMay, Rawls Frazier, Mark E. Okazaki
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Publication number: 20090029883Abstract: A method for improving the oxidation stability of an ashless hydraulic fluid or an ashless paper machine oil, comprising: a. selecting a base oil having greater than 90 wt % saturates, less than 10 wt % aromatics, a base oil viscosity index greater than 120, less than 0.03 wt % sulfur, a sequential number of carbon atoms, greater than 35 wt % total molecules with cycloparaffinic functionality, and a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 2.1; and b. replacing a portion of an original base oil in the ashless oil with the selected base oil to produce an improved ashless lubricating oil; wherein the improved ashless lubricating oil has a result in the rotary pressure vessel oxidation test that is at least 50 minutes greater than the result in the rotary pressure oxidation test of the ashless hydraulic fluid or ashless paper machine oil.Type: ApplicationFiled: August 6, 2008Publication date: January 29, 2009Inventors: William Loh, John M. Rosenbaum, Nancy J. Bertrand, Patricia LeMay, Rawls Frazier, Mark E. Okazaki
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Patent number: 7458044Abstract: Methods and structure for improved simulation of CDM ESD events and for remediation of circuit designs correcting for previously inexplicable damage to core circuits of an application circuit design caused by such events. Features and aspects hereof note that such previously inexplicable damage to core circuits of an application circuit design is caused by inductive coupling between the non-core circuits and the core circuits of an application circuit design. Improved simulation techniques in accordance with features and aspects hereof may predict where such inductive coupling may cause damage to core circuits. Other features and aspects hereof may alter an application circuit design to provide remediation by automated insertion of additional buffer circuitry to core traces of the core circuitry that may be impacted by such inductive coupling.Type: GrantFiled: February 7, 2006Date of Patent: November 25, 2008Assignee: LSI CorporationInventors: Choshu Ito, Li Lynn Ooi, William Loh
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Publication number: 20080029430Abstract: A hydraulic fluid composition having excellent seal compatibility is prepared from an isomerized base oil is provided. The composition comprising (i) 80 to 99.999 wt. % of a lubricating base oil having consecutive numbers of carbon atoms, less than 10 wt % naphthenic carbon by n-d-M, less than 0.10 wt. % olefins and less than 0.05 wt. % aromatics, a molecular weight of greater than 600 by ASTM D 2503-92 (Reapproved 2002), a wt % total molecules with cycloparaffinic functionality greater than 25 and a ratio of molecules with monocycloparaffinic functionality to molecules with multicyloparaffinic functionality greater than 10; and (ii) optionally from 0.001 to 6 wt % of a viscosity modifier; and (iii) 0-10 wt % of at least an additive package. When used in operations, the composition results in an average volume change in a rubber seal of less than 3% and an average hardness change in the rubber seal of less than 1 pts. when tested under ASTM D 471-06 (SRE NBR1 at 100° C., 168 hours).Type: ApplicationFiled: August 28, 2007Publication date: February 7, 2008Applicant: Chevron USA Inc.Inventors: William Loh, John Rosenbaum, Nancy Bertrand, Patricia Lemay
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Publication number: 20070142240Abstract: An ashless hydraulic fluid or paper machine oil having a VI between 155 and 300, a RPVOT greater than 680 minutes, and a kinematic viscosity at 40° C. from 19.8 cSt to 748 cSt. An ashless hydraulic fluid or paper machine oil having a high VI and high RPVOT comprising: a) a Group III base oil with a sequential number of carbon atoms, and defined cycloparaffin composition or low traction coefficient, b) an ashless antioxidant additive concentrate, and c) low amount of VI improver. A process for making an ashless hydraulic fluid or paper machine oil comprising a) hydroisomerization dewaxing, b) fractionating, c) selecting a fraction having a very high VI, and a high level of molecules with cycloparaffinic functionality or a low traction coefficient, and d) blending the fraction with an ashless antioxidant. Also, a method of improving the oxidation stability of an ashless hydraulic fluid or paper machine oil.Type: ApplicationFiled: December 21, 2005Publication date: June 21, 2007Inventors: William Loh, John Rosenbaum, Nancy Bertrand, Patricia LeMay, Rawls Frazier, Mark Okazaki