Patents by Inventor Kexing Liu
Kexing Liu 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: 20220192482Abstract: A method and apparatus for generating a visual field pattern which serves as a subjective test protocol to evaluate central vision using dynamic image generation to prevent the brain from filling-in to provide better results of patient feedback and reporting of locations of visual disturbance. This enables effective central vision testing to detect the presence of visual field disruptions including scotoma, visual-neurological perceptual effects such as filling-in, and Troxler fading. The present method and apparatus can be used for vision monitoring and self-assessment, and more particularly for monitoring vision for damage or disease to the macula or retina.Type: ApplicationFiled: December 15, 2021Publication date: June 23, 2022Inventors: Kexing Liu, Anirbaan Mukherjee
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Publication number: 20210085176Abstract: A multi-spectral light generating unit, a fundus imaging system, and a fundus imaging method. The multi-spectral light generating unit includes one or more illumination units and a control unit; each illumination unit includes a light-emitting diode matrix, each light-emitting diode matrix emits light of multiple wavelengths; converting, by the control unit, the control instruction sent by the central controller into a control signal; triggering, by the control unit, the specified light-emitting diode matrix of the specified illumination unit to emit light of a preset wavelength and preset energy to output the multi-spectral light.Type: ApplicationFiled: January 21, 2019Publication date: March 25, 2021Inventors: Kexing Liu, Xuechuan Dong, Yequan Huang, Hongwei Gong, Xuelian Zhang, Jinsong Zhang, Zeljko Ribaric
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Publication number: 20200345229Abstract: Disclosed is a fundus camera, which relates to the technical field of medical devices and includes: an illumination module, a main optical assembly, a focusing module, and an image sensing acquisition module; the illumination module includes a plurality of light sources configured to emit light of different wavelengths, illumination light emitted by the plurality of light sources is conducted to enter an eye of a patient through the main optical assembly, and light reflected by a retina of the patient is conducted to pass through the main optical assembly and the focusing module to enter the image sensing acquisition module. The fundus camera provided by the present application improves the technical problem that the fundus camera in the prior art cannot image different layers of the retina, thereby providing valuable medical and diagnostic data.Type: ApplicationFiled: January 22, 2019Publication date: November 5, 2020Inventors: Yequan Huang, Jianwei Ren, Zhenhua Chen, Xuechuan Dong, Feiyan Ma, Jinsong Zhang, Sha Lai, Kexing Liu, Zeljko Ribaric
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Publication number: 20200329962Abstract: Retina digital imaging system, instrument and method A retina digital imaging system includes: an illumination module (1), a main optical assembly (3), and an image sensor module (2); the illumination module (1) includes light-emitting diodes capable of emitting light with different wavelengths, and each light-emitting diode emits light to enter the retina through the main optical assembly (3) to form an illumination optical path; the light reflected by the retina passes through the main optical assembly (3) and forms an image on the image sensor module (2) to form an imaging optical path. The various spectral bands formed by light-emitting diodes may form a wider spectrum, so different layers of the retina may be imaged to provide valuable medical and diagnostic data.Type: ApplicationFiled: December 24, 2018Publication date: October 22, 2020Inventors: Ningli Wang, Yequan Huang, Jinsong Zhang, Jianwei Ren, Chao Ma, Zhenhua Chen, Xuechuan Dong, Yi Zhen, Kexing Liu, Zeljko Ribaric
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Patent number: 8338186Abstract: A system and method for purifying an aqueous contaminated fluid from colloidal contaminants using a closed-loop feedback control system are disclosed. Contaminated fluid flows into a mixer and mixed with a purifying agent, such as diatomaceous earth, to facilitate metathesis reaction between the purifying agent and the contaminants. The purifying agent entraps the contaminants, and is subsequently removed in a separator into sediments. An estimation of the amount of the purifying agent to dispense is performed using pre-defined equations or look-up tables stored in the database, including relationship between the concentration of contaminants in the fluid and the concentration of the added purifying agent. An automated feedback control is applied to fine tune the purification process into compliance with regulations. High accuracy of measurements is ensured by selecting the same material for both the purifying agent and the trapping medium of analyzers, and additionally by the design of the analyzers.Type: GrantFiled: May 31, 2010Date of Patent: December 25, 2012Assignee: Ecovu Analytics Inc.Inventors: Bryan R. Hollebone, Kexing Liu, Michael Allan Donkers
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Publication number: 20100237018Abstract: A system and method for purifying an aqueous contaminated fluid from colloidal contaminants using a closed-loop feedback control system are disclosed. Contaminated fluid flows into a mixer and mixed with a purifying agent, such as diatomaceous earth, to facilitate metathesis reaction between the purifying agent and the contaminants. The purifying agent entraps the contaminants, and is subsequently removed in a separator into sediments. An estimation of the amount of the purifying agent to dispense is performed using pre-defined equations or look-up tables stored in the database, including relationship between the concentration of contaminants in the fluid and the concentration of the added purifying agent. An automated feedback control is applied to fine tune the purification process into compliance with regulations. High accuracy of measurements is ensured by selecting the same material for both the purifying agent and the trapping medium of analyzers, and additionally by the design of the analyzers.Type: ApplicationFiled: May 31, 2010Publication date: September 23, 2010Inventors: Bryan R. Hollebone, Kexing Liu, Michael Allan Donkers
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Patent number: 6892032Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: GrantFiled: December 20, 2002Date of Patent: May 10, 2005Assignee: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Patent number: 6795652Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: GrantFiled: December 20, 2002Date of Patent: September 21, 2004Assignee: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Patent number: 6775479Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: GrantFiled: December 20, 2002Date of Patent: August 10, 2004Assignee: Nortel Networks CorporationInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Patent number: 6757498Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: GrantFiled: December 20, 2002Date of Patent: June 29, 2004Assignee: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Patent number: 6751418Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: GrantFiled: December 20, 2002Date of Patent: June 15, 2004Assignee: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Patent number: 6748174Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: GrantFiled: December 20, 2002Date of Patent: June 8, 2004Assignee: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Publication number: 20030215238Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: ApplicationFiled: December 20, 2002Publication date: November 20, 2003Applicant: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Patent number: 6631018Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: GrantFiled: August 27, 1997Date of Patent: October 7, 2003Assignee: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Publication number: 20030170026Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: ApplicationFiled: December 20, 2002Publication date: September 11, 2003Applicant: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Publication number: 20030170027Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: ApplicationFiled: December 20, 2002Publication date: September 11, 2003Applicant: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Publication number: 20030170029Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: ApplicationFiled: December 20, 2002Publication date: September 11, 2003Applicant: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Publication number: 20030161635Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: ApplicationFiled: December 20, 2002Publication date: August 28, 2003Applicant: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Publication number: 20030123881Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: ApplicationFiled: December 20, 2002Publication date: July 3, 2003Applicant: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon
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Patent number: 6563615Abstract: A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.Type: GrantFiled: December 7, 2000Date of Patent: May 13, 2003Assignee: Nortel Networks LimitedInventors: David Milton, Tomas Valis, Gino Totti, Kexing Liu, Michel Pigeon