Patents by Inventor Kai Guo

Kai Guo 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).

  • Patent number: 8680228
    Abstract: Methods for making P4HB polymers and copolymers thereof that are useful for preparing controlled release systems, medical devices and as intermediates in chemical synthesis, have been developed. These methods avoid the use of organic solvents, and basic conditions that can cause transesterification reactions with polymer terminal end groups or elimination reactions. A preferred embodiment is a method for producing polymers of P4HB with weight average molecular weight less than 250,000, and more preferably, less than 100,000, and a Pd of less than 3, which are useful in controlled release. A particularly preferred embodiment utilizes aqueous acetic acid to hydrolyze pellets of P4HB polymers and copolymers while in suspension.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: March 25, 2014
    Assignee: Tepha, Inc.
    Inventors: Kai Guo, David P. Martin
  • Patent number: 8473997
    Abstract: Embodiments of the present disclosure provide a channel changing method, apparatus, and system. A network side device records in real time a timestamp of a media packet of a multicast media stream which enters a buffer, and a key frame which enters the buffer; when a terminal's channel changing request has been detected, obtains a first timestamp of a media packet which enters the buffer at a channel changing request moment, and a second timestamp of a media packet in which a key frame which is of the target channel and is the last to enter the buffer is located in the media packet; determines a timestamp difference between the first timestamp and the second timestamp; and transmits the timestamp difference and a burst media stream of the target channel to the terminal. In the embodiments of the present disclosure, a delay in playing the multicast media stream by the terminal is reduced.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: June 25, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zhigang Qiu, Kai Guo, Wenle Yang, Xia Qin, Hewen Zheng
  • Publication number: 20120304236
    Abstract: Embodiments of the present disclosure provide a channel changing method, apparatus, and system. A network side device records in real time a timestamp of a media packet of a multicast media stream which enters a buffer, and a key frame which enters the buffer; when a terminal's channel changing request has been detected, obtains a first timestamp of a media packet which enters the buffer at a channel changing request moment, and a second timestamp of a media packet in which a key frame which is of the target channel and is the last to enter the buffer is located in the media packet; determines a timestamp difference between the first timestamp and the second timestamp; and transmits the timestamp difference and a burst media stream of the target channel to the terminal. In the embodiments of the present disclosure, a delay in playing the multicast media stream by the terminal is reduced.
    Type: Application
    Filed: August 3, 2012
    Publication date: November 29, 2012
    Applicant: Huawei Technologies Co., Ltd.
    Inventors: Zhigang Qiu, Kai Guo, Wenle Yang, Xia Qin, Hewen Zheng
  • Publication number: 20120150285
    Abstract: Continuous processing methods for making absorbable polymeric dry spun non-wovens with one or more of the following properties: high burst strength, fine fibers of average diameter from 0.01 ?m to 50 ?m, and thickness from 10 ?m to 10 mm, have been developed. Improved fiber cohesion is made possible by controlling the tackiness of the fibers of the non-woven during web collection. The polymer is preferably a polyhydroxyalkanoate, more preferably, a 4-hydroxybutyrate polymer or copolymer. A non-woven of poly-4-hydroxybutyrate is most preferred. The non-wovens have fine fibers with average diameters ranging from 0.01 ?m to 50 ?m, and are derived by dry spun processing, during which a solution of polymer(s) is injected into a stream of high velocity air with a pressure of 1 to 500 psi for solvent stripping and polymer strand attenuation. The non-wovens can be used for a variety of purposes including fabrication of medical devices.
    Type: Application
    Filed: June 15, 2011
    Publication date: June 14, 2012
    Inventors: Ryan Cahil, Kai Guo, David P. Martin, Said Rizk
  • Patent number: 8019804
    Abstract: The present invention relates to a method and apparatus for calculating the Sum of Squared Differences (SSD) between a source block and a reconstructed block of image or video data encoding according to an encoding scheme such as H.264/AVC. In a preferred embodiment, the method computes the SSD by finding the SSD between coefficients of an integer transformed residual block and the corresponding inverse-quantized coefficients. Preferably the inverse quantized coefficients are found with the aid of a look up table. This method may save computing time and processing power compared to calculating the SSD directly from the source and reconstructed blocks. The SSD is related to the distortion caused by encoding and the method may be used in calculating the rate-distortion of a particular encoding mode. One embodiment of the invention encodes a block of data by selecting the encoding mode with the least rate-distortion.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: September 13, 2011
    Assignee: City University of Hong Kong
    Inventors: Lai-Man Po, Kai Guo
  • Publication number: 20110219414
    Abstract: A method, an apparatus and a system for switching channels are disclosed. The method includes: buffering a multicast Internet Protocol (IP) packet of a live channel; receiving a channel switching request sent by a client for switching to the live channel, and pushing the buffered multicast IP packet to the client; and judging whether the pushed multicast IP packet is synchronous to a real-time multicast IP packet of the live channel; and stopping pushing the buffered multicast IP packet to the client and sending the real-time multicast IP packet to the client if the pushed multicast IP packet is synchronous to the real-time multicast IP packet. The embodiments of the present invention involve no modification of the user terminal and improve the universal applicability and extensibility of the channel switching solution.
    Type: Application
    Filed: May 17, 2011
    Publication date: September 8, 2011
    Inventors: Kai GUO, Xia Qin, Hewen Zheng
  • Publication number: 20110015367
    Abstract: Functionalized poly(ester-amides) and poly(ether ester amides) polymers having the structural formula: wherein R1 is (C2-C28)alkylene, or (C2-C28)alkylene substituted with a side chain selected from the group consisting of (2-carboxyethyl)thio, (2-hydroxethyl)thio, (2-aminoethyl)thio and (2-aminoethyl)thio hydrochloride salt; R3 is selected from the group consisting of hydrogen, (C1-C6)alkyl, and (C6-C10)aryl (C1-C6)alkyl; and R4 is selected from the group consisting of (C2-C28)alkyloxy, (C2-C28)alkylene substituted with a side chain selected from the group consisting of (2-carboxyethyl)thio, (2-hydroxethyl) thio, (2-aminoethyl)thio and (2-aminoethyl)thio hydrochloride salt, and —C2H4(OC2H4)x; x ranges from 2-4; n ranges from 5 to 150; and wherein at least one of R1 and R4 attaches a functional group.
    Type: Application
    Filed: November 20, 2009
    Publication date: January 20, 2011
    Applicant: Cornell University
    Inventors: Chih-Chang Chu, Ramaz Katsarava, Kai Guo
  • Patent number: 7863406
    Abstract: Biodegradable poly(ester-amides) are synthesized from amino acids, diols and dicarboxylic acids where one or both of the diols and dicarboxylic acids contain unsaturation; e.g., from di-p-nitrophenyl dicarboxylates and p-toluenesulfonic acid salts of bis(alpha-amino acid) disesters of diols where one or both of the dicarboxylate and diol moieties contain unsaturation or from di-p-nitrophenyl dicarboxylates, and p-toluene-sulfonic acid salts of bis(alpha-amino acid) diesters of diols and p-toluenesulfonic acid salt of lysine ester where one or both of the dicarboxylate and diol moieties contain unsaturation. The polymers are useful as biodegradable carriers for drugs of other bioactive agents.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: January 4, 2011
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Chih-Chang Chu, Ramaz Katsarava, Kai Guo
  • Publication number: 20080243971
    Abstract: The present invention relates to a method and apparatus for calculating the Sum of Squared Differences (SSD) between a source block and a reconstructed block of image or video data encoding according to an encoding scheme such as H.264/AVC. In a preferred embodiment, the method computes the SSD by finding the SSD between coefficients of an integer transformed residual block and the corresponding inverse-quantized coefficients. Preferably the inverse quantized coefficients are found with the aid of a look up table. This method may save computing time and processing power compared to calculating the SSD directly from the source and reconstructed blocks. The SSD is related to the distortion caused by encoding and the method may be used in calculating the rate-distortion of a particular encoding mode. One embodiment of the invention encodes a block of data by selecting the encoding mode with the least rate-distortion.
    Type: Application
    Filed: March 26, 2007
    Publication date: October 2, 2008
    Inventors: Lai-Man Po, Kai Guo
  • Publication number: 20070167605
    Abstract: Biodegradable poly(ester-amides) are synthesized from amino acids, diols and dicarboxylic acids where one or both of the diols and dicarboxylic acids contain unsaturation; e.g., from di-p-nitrophenyl dicarboxylates and p-toluenesulfonic acid salts of bis(alpha-amino acid) disesters of diols where one or both of the dicarboxylate and diol moieties contain unsaturation or from di-p-nitrophenyl dicarboxylates, and p-toluene-sulfonic acid salts of bis(alpha-amino acid) diesters of diols and p-toluenesulfonic acid salt of lysine ester where one or both of the dicarboxylate and diol moieties contain unsaturation. The polymers are useful as biodegradable carriers for drugs of other bioactive agents.
    Type: Application
    Filed: May 31, 2005
    Publication date: July 19, 2007
    Applicant: Cornell Research Foundation, Inc.
    Inventors: Chih-Chang Chu, Ramaz Katsarava, Kai Guo
  • Patent number: 7097507
    Abstract: An electrical connector (100) comprises an insulative housing (1), a plurality of contacts (2) assembled to the insulative housing (1), and a shell (3) having at least a spring piece (31) with at least a protrusion projected outward. With the set of the protrusion, the electrical connection between the electrical connector (100) and a chassis panel may be improved and reliable.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: August 29, 2006
    Assignee: Hon Hai Precision Ind. Co., Ltd.
    Inventors: George Huanyi Zhang, Zhi-Kai Guo, Lin Huang
  • Patent number: 6827916
    Abstract: A preparation method of silica, especially superfine silica, with water glass and carbon dioxide as major raw materials in a carbonization reaction conducted under a high gravity field, typically in a Higee reactor.
    Type: Grant
    Filed: May 13, 2003
    Date of Patent: December 7, 2004
    Assignee: Beijing University of Chemical Technology
    Inventors: Kai Guo, Jianfeng Chen, Fen Guo, Hong Jia
  • Publication number: 20040121651
    Abstract: An electrical connector (1) includes a dielectric housing (10), a plurality of terminals (12) received in the housing, and a retention mechanism (2) attached to the housing. The housing forms a pair of first mating members (103) at opposite ends thereof. Each terminal has a bending portion (124). The retention mechanism has an elongate stopper body (20). The stopper body has cantilevers (22) at opposite sides thereof. The cantilevers each define a second mating member (220) respectively mating with a corresponding first mating member, so that the stopper body presses on the bending portions of the terminals. Thus the terminals are firmly retained in the housing. In addition, the cantilevers are easily rotated outwardly so that the retention mechanism is assembled on and disassembled from the housing conveniently and safely.
    Type: Application
    Filed: April 18, 2003
    Publication date: June 24, 2004
    Inventor: Zhi-Kai Guo
  • Patent number: 6736650
    Abstract: An electrical connector (1) includes a dielectric housing (10), a plurality of terminals (13) received in the housing, and a retention mechanism (12) pivotally attached to the housing. The housing defines a plurality of terminal-passages (108) and first mating members (103). Each of terminals includes a bent portion (134). The retention mechanism has an elongate stopper member (120). A pair of cantilevers (122) depends from the stopper member. A second mating member (1222) is formed on each of the cantilevers, for engaging one of the first mating members. Thus the stopper member is rotatable between a first position in which the stopper is protected from thermal warp or deformation, and a second position in which the terminals are secured in the corresponding terminal-passages.
    Type: Grant
    Filed: April 21, 2003
    Date of Patent: May 18, 2004
    Assignee: Hon Hai Precision Ind. Co., Ltd.
    Inventors: I-Hsin Chen, Chien-Sen Huang, Zhi-Kai Guo
  • Publication number: 20030219370
    Abstract: A preparation method of silica, especially superfine silica, with water glass and carbon dioxide as major raw materials in a carbonization reaction conducted under a high gravity field, typically in a Higee reactor.
    Type: Application
    Filed: May 13, 2003
    Publication date: November 27, 2003
    Inventors: Kai Guo, Jianfeng Chen, Fen Guo, Hong Jia