Patents by Inventor Robert D. Stevens
Robert D. Stevens 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: 20260157697Abstract: A method for monitoring a biological signal in a wearable context includes receiving first sensor data from a first sensor including a first electrode and a second electrode, the first sensor being disposed proximate to a chest of a wearer, receiving second sensor data from a second sensor including a third electrode and a fourth electrode, the second sensor being disposed proximate a distal end of a limb of the wearer, synchronizing the first sensor data and the second sensor data to extract signal data from the first and second sensor data, performing feature extraction on the first and second sensor data to estimate the biological signal based on comparing results of the feature extraction to a model, and storing a continuous record of the biological signal.Type: ApplicationFiled: September 27, 2025Publication date: June 11, 2026Applicant: The Johns Hopkins UniversityInventors: Francesco V. Tenore, Abby R. Joseph, Robert D. Stevens, Ralph Etienne-Cummings, John Rattray
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Patent number: 10516546Abstract: An energy control network may include a number of load control devices, such as dimmer switches, multi-button selector switch, occupancy sensors, and remote controllers, among others. These load control devices may be configured for wireless communication. Other wireless devices, such as laptops, tablets, and “smart” cellular phones may be configured to communicate with the load control devices of the energy control network. The load control devices and the other wireless communication devices may also be configured for Near Field Communication (NFC). NFC may be used to provide a load control device with its initial default configuration and/or an application specific configuration. Also, NFC may be used to transfer a configuration from one load control device that may have become faulty, to a replacement load control device. And NFC may be used to provide and trigger commands that may cause a load control load device to operate in a predetermined manner.Type: GrantFiled: November 19, 2018Date of Patent: December 24, 2019Assignee: Lutron Technology Company LLCInventors: John C. Browne, Jr., Sean Henley, Ratan Dominic Rego, William Bryce Fricke, Robert D. Stevens
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Publication number: 20190089551Abstract: An energy control network may include a number of load control devices, such as dimmer switches, multi-button selector switch, occupancy sensors, and remote controllers, among others. These load control devices may be configured for wireless communication. Other wireless devices, such as laptops, tablets, and “smart” cellular phones may be configured to communicate with the load control devices of the energy control network. The load control devices and the other wireless communication devices may also be configured for Near Field Communication (NFC). NFC may be used to provide a load control device with its initial default configuration and/or an application specific configuration. Also, NFC may be used to transfer a configuration from one load control device that may have become faulty, to a replacement load control device. And NFC may be used to provide and trigger commands that may cause a load control load device to operate in a predetermined manner.Type: ApplicationFiled: November 19, 2018Publication date: March 21, 2019Applicant: Lutron Electronics Co., Inc.Inventors: John C. Browne, Sean Henley, Ratan Dominic Rego, William Bryce Fricke, Robert D. Stevens
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Publication number: 20020102737Abstract: Provided are methods of screening subjects for lysosomal storage diseases, preferably glycogen storage diseases, using a tetrasaccharide as a biomarker. In a more preferred embodiment, subjects are screened for Pompe disease (i.e., glycogen storage disease type II). Also provided are neonatal screening assays. The present invention further provides methods of monitoring the clinical condition and efficacy of therapeutic treatment in affected subjects. Further provided are methods of measuring a tetrasaccharide biomarker by tandem mass spectrometry, preferably, as part of a neonatal screening assay for Pompe disease.Type: ApplicationFiled: June 6, 2001Publication date: August 1, 2002Inventors: David S. Millington, Yan An, Yuan Tsong Chen, Robert D. Stevens, Sarah P. Young, Johan L. K. Van Hove
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Patent number: 5869792Abstract: An acoustic duct silencer is disclosed having opposed sidewall baffles which are disposed in a duct such that a cavity is defined between the baffles and the adjacent duct sidewalls, the space between the baffles bordering a passageway in the duct for the flow of a fluid medium therethrough. Each baffle features an array of generally parallel, spaced-apart elongate slots which substantially span the vertical or horizontal breadth of the baffles. The baffles preferably have a relatively large effective thickness so that the slots formed therein have a significant depth to them. In this manner, an integral array of resonators are provided having a significant slot or throat depth for the attenuation of low frequency sound.Type: GrantFiled: December 4, 1996Date of Patent: February 9, 1999Assignee: Vibron LimitedInventors: Donald L. Allen, Robert D. Stevens
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Patent number: 5361701Abstract: A plastic cartridge has a base with a primer pocket and a primer mounted therein. A propellant charge is located within the cartridge and a plastic, collapsible wad is positioned within the cartridge above the propellant charge. A strawlike fusing channel extends through the wad into the propellant charge and is packed with an igniter charge. The fusing channel communicates between the propellant charge and a tracer charge packed within a cavity in a lead shotgun slug. The wad has a plurality of upwardly extending petals which surround the slug within the cartridge and which engage with the rifling of a shotgun barrel when the round is fired.Type: GrantFiled: August 9, 1993Date of Patent: November 8, 1994Inventor: Robert D. Stevens
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Patent number: 5235915Abstract: A plastic cartridge has a base with a primer pocket and a primer mounted therein. A propellant charge is located within the cartridge and a plastic, collapsible wad is positioned within the cartridge above the propellant charge. A strawlike fusing channel extends through the wad into the propellant charge and is packed with an igniter charge. The fusing channel communicates between the propellant charge and a tracer charge packed within a cavity in a lead shotgun slug. The wad has a plurality of upwardly extending petals which surround the slug within the cartridge and which engage with the rifling of a shotgun barrel when the round is fired.Type: GrantFiled: May 26, 1992Date of Patent: August 17, 1993Inventor: Robert D. Stevens
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Patent number: 4699826Abstract: Highly uniform polymeric microbeads of a predetermined size, preferably having an attached fluorescent label on the surface, are prepared by causing seed particles to swell by absorption of a plurality of low molecular weight substances, at least one of which is a monomer having a reactive functional group. After absorption, the monomer is internally polymerized, and the reactive functional group is preferably reacted with a polyfunctional spacing agent thereby to provide a second reactive functional group. The latter is then reacted with a fluorescent label to provide the labeled microbead.Type: GrantFiled: June 30, 1986Date of Patent: October 13, 1987Assignee: Becton, Dickinson and CompanyInventors: Abraham Schwartz, Joel Williams, Robert D. Stevens
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Patent number: 4699828Abstract: Highly uniform polymeric microbeads of a predetermined size, preferably having an attached fluorescent label on the surface, are prepared by causing seed particles to swell by absorption of a plurality of low molecular weight substances, at least one of which is a monomer having a reactive functional group. After absorption, the monomer is internally polymerized, and the reactive functional group is preferably reacted with a polyfunctional spacing agent thereby to provide a second reactive functional group. The latter is then reacted with a fluorescent label to provide the labeled microbead.Type: GrantFiled: June 30, 1986Date of Patent: October 13, 1987Assignee: Becton, Dickinson and CompanyInventors: Abraham Schwartz, Joel Williams, Robert D. Stevens
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Patent number: 4698262Abstract: Highly uniform polymeric microbeads of a predetermined size, preferably having an attached fluorescent label on the surface, are prepared by causing seed particles to swell by absorption of a plurality of low molecular weight substances, at least one of which is a monomer having a reactive functional group. After absorption, the monomer is internally polymerized, and the reactive functional group is preferably reacted with a polyfunctional spacing agent thereby to provide a second reactive functional group. The latter is then reacted with a fluorescent label to provide the labeled microbead.Type: GrantFiled: June 30, 1986Date of Patent: October 6, 1987Assignee: Becton, Dickinson and CompanyInventors: Abraham Schwartz, Joel Williams, Robert D. Stevens
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Patent number: 4609689Abstract: Highly uniform polymeric microbeads of a predetermined size, preferably having an attached fluorescent label on the surface, are prepared by causing seed particles to swell by absorption of a plurality of low molecular weight substances, at least one of which is a monomer having a reactive functional group. After absorption, the monomer is internally polymerized, and the reactive functional group is preferably reacted with a polyfunctional spacing agent thereby to provide a second reactive functional group. The latter is then reacted with a fluorescent label to provide the labeled microbead.Type: GrantFiled: January 28, 1985Date of Patent: September 2, 1986Assignee: Becton, Dickinson and CompanyInventors: Abraham Schwartz, Joel Williams, Robert D. Stevens
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Patent number: 4134216Abstract: An apparatus for removing moisture from a moisture containing product in which the improvement consists of removing latent heat from the moisture removed from the product and reintroducing the latent heat as sensible heat to heat the air stream which is used to remove the moisture from the product, thus providing a continuous closed cycle drying process which includes its own heat supply.Type: GrantFiled: November 18, 1977Date of Patent: January 16, 1979Inventor: Robert D. Stevens