Patents by Inventor Philip John Stephens
Philip John Stephens 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: 9968270Abstract: Example embodiments assess cardiovascular health by receiving, from at least one monitoring device, pulse rate data from a subject. The pulse rate data includes pulse rate measurements and corresponding measurement timestamps. The embodiments select, with at least one processor, a plurality of recovery periods in the pulse rate data. Each recovery period corresponds to a respective decrease in pulse rate from a respective upper pulse rate to a respective lower pulse rate. The respective upper pulse rate is less than a peak pulse rate of the subject or the respective lower pulse rate is greater than a resting pulse rate of the subject. The embodiments determine, with the at least one processor, an exponential decay from the plurality of selected recovery periods. The exponential decay characterizes a pulse rate recovery for the subject. The embodiments provide, via a user interface, the pulse rate recovery based on the exponential decay.Type: GrantFiled: January 6, 2016Date of Patent: May 15, 2018Assignee: Verily Life Sciences LLCInventors: Mark Murphy, Philip John Stephens
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Patent number: 9695814Abstract: A method and apparatus for reducing undesirable noise generated by a vacuum pumping system. The vacuum system operates to reduce the pressure in a chamber to a first pressure value. The system then detects that the pressure at the vacuum pump system's inlet is about to change to a second higher pressure and, in response, the speed of a booster pump in the vacuum pump system is reduced below the rated speed for the pump. When the pressure at the vacuum pump's inlet is above the second pressure, the speed of the booster pump is increased to the rated speed. Thus, the booster pump is slowed down prior the pump system becoming exposed to a rapid increase in inlet pressure.Type: GrantFiled: May 31, 2012Date of Patent: July 4, 2017Assignee: Edwards LimitedInventors: Philip John Stephens, Michael Geoffrey Thompson
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Patent number: 9334863Abstract: A pump includes a plurality of pumping stages comprising a respective plurality of pumping mechanisms driven by one or more drive shafts for pumping fluid through the pumping stages from a pump inlet at a high vacuum stage to a pump outlet at a low vacuum stage; a lubrication chamber housing a bearing assembly for supporting the drive shaft for rotational movement, the drive shaft extending from the high vacuum stage to the lubrication chamber through an opening of a head plate of the lubrication chamber; an inter-stage purge port through which gas can enter the pump at an inter-stage location downstream of the high vacuum; a lubrication chamber purge port located in the lubrication chamber through which purge gas can flow from a source of purge gas; wherein the inter-stage port is connected to the lubrication chamber for controlling the pressure of purge gas in the lubrication chamber.Type: GrantFiled: November 23, 2010Date of Patent: May 10, 2016Assignee: Edwards LimitedInventors: Philip John Stephens, Ian David Stones, Malcolm William Gray, Paul David Neller
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Patent number: 9261099Abstract: Vacuum pump for pumping gas from a process chamber, the pump comprising: a rotor supported for rotation in a pumping chamber by a drive shaft, the shaft extending through a shaft bore in a wall of the pumping chamber extending transversely to the drive shaft, and a seal arrangement provided between the shaft and the transverse wall for resisting the passage of gas through the shaft bore, wherein on rotation of the rotor gas is pumped from a low pressure region at an inlet of the pumping chamber to a high pressure region at an outlet of the pumping chamber, and wherein the rotor and the transverse wall are spaced apart by an axial clearance along which back leakage of gas can flow from the high pressure region to the low pressure region, and an additional leakage path for back leakage is formed spaced away from the seal arrangement along which gas can flow without contact with the seal arrangement so that the amount of gas which contacts the seal arrangement during use of the pump is reduced.Type: GrantFiled: October 12, 2010Date of Patent: February 16, 2016Assignee: Edwards LimitedInventor: Philip John Stephens
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Patent number: 9255993Abstract: A method, system, and apparatus provide the ability to estimate ionospheric observables using space-borne observations. Space-borne global positioning system (GPS) data of ionospheric delay are obtained from a satellite. The space-borne GPS data are combined with ground-based GPS observations. The combination is utilized in a model to estimate a global three-dimensional (3D) electron density field.Type: GrantFiled: February 8, 2013Date of Patent: February 9, 2016Assignee: California Institute of TechnologyInventors: Philip John Stephens, Attila Komjathy, Brian D. Wilson, Anthony J. Mannucci
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Publication number: 20140127038Abstract: A method and apparatus for reducing undesirable noise generated by a vacuum pumping system. The vacuum system operates to reduce the pressure in a chamber to a first pressure value. The system then detects that the pressure at the vacuum pump system's inlet is about to change to a second higher pressure and, in response, the speed of a booster pump in the vacuum pump system is reduced below the rated speed for the pump. When the pressure at the vacuum pump's inlet is above the second pressure, the speed of the booster pump is increased to the rated speed. Thus, the booster pump is slowed down prior the pump system becoming exposed to a rapid increase in inlet pressure.Type: ApplicationFiled: May 31, 2012Publication date: May 8, 2014Applicant: EDWARDS LIMITEDInventors: Philip John Stephens, Michael Geoffrey Thompson
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Publication number: 20120251368Abstract: The present invention provides a positive displacement dry pump comprising: a plurality of vacuum pumping stages comprising a respective plurality of pumping mechanisms driven by one or more drive shafts for pumping fluid in series through the pumping stages from a pump inlet at the high vacuum stage to a pump outlet at the low vacuum stage; a lubrication chamber housing a bearing assembly for supporting the drive shaft for rotational movement, the drive shaft extending from the high vacuum stage to the lubrication chamber through an opening of a head plate of the lubrication chamber; an inter-stage purge port through which gas can enter the pump at an inter-stage location downstream of the high vacuum stage and pass only through the or each vacuum pumping stage downstream of the inter-stage port; a lubrication chamber purge port located in the lubrication chamber through which purge gas can flow from a source of purge gas; wherein the inter-stage port is connected to the lubrication chamber for controlling tType: ApplicationFiled: November 23, 2010Publication date: October 4, 2012Applicant: EDWARDS LIMITEDInventors: Philip John Stephens, Ian David Stones, Malcolm William Gray, Paul David Neller
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Publication number: 20120219407Abstract: Vacuum pump for pumping gas from a process chamber, the pump comprising: a rotor supported for rotation in a pumping chamber by a drive shaft, the shaft extending through a shaft bore in a wall of the pumping chamber extending transversely to the drive shaft, and a seal arrangement provided between the shaft and the transverse wall for resisting the passage of gas through the shaft bore, wherein on rotation of the rotor gas is pumped from a low pressure region at an inlet of the pumping chamber to a high pressure region at an outlet of the pumping chamber, and wherein the rotor and the transverse wall are spaced apart by an axial clearance along which back leakage of gas can flow from the high pressure region to the low pressure region, and an additional leakage path for back leakage is formed spaced away from the seal arrangement along which gas can flow without contact with the seal arrangement so that the amount of gas which contacts the seal arrangement during use of the pump is reduced.Type: ApplicationFiled: October 12, 2010Publication date: August 30, 2012Applicant: EDWARDS LIMITEDInventor: Philip John Stephens