Patents by Inventor Paul Chan
Paul Chan 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: 6907228Abstract: A mobile communications network includes a plurality of cells and cell sectors in each cell. Carrier frequencies for carrying beacon control signaling, such as a broadcast control channel (BCCH), are assigned from the entire band of available carrier frequencies. The same carrier frequencies are assigned to carry traffic channels. This arrangement enables the use of one carrier frequency to communication beacon control signaling in one cell segment, while also allowing the use of the same one carrier frequency to communicate bearer traffic in another cell segment, thus affording substantial increases in network capacity that has heretofore not been possible in networks in the absence of significant infrastructure buildout or modification.Type: GrantFiled: January 24, 2002Date of Patent: June 14, 2005Assignee: Nortel Networks LimitedInventors: Anit Lohtia, Yuqiang Tang, Paul Chan H. Tse
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Publication number: 20050024962Abstract: A symmetric dual-voltage charge pump and its control circuit generate bipolar output voltages. The charge pump converts a unipolar power source to a set of dual-voltage outputs of opposite polarity that are completely independent of each other. The charge pump includes two voltage-boosting transfer capacitors and two output capacitors. Two-phase operation generates an increased-magnitude output voltage of a negative polarity and another two phases of operation generate an increased output voltage of a positive polarity. The charge pump selectively charges one or both of the bipolar outputs with individual 2-phase charge cycles or with a sequence of charge cycles. When controlled by comparators with unequal reference voltages, the charge pump can force the bipolar outputs to unequal positive and negative voltages. Charge pumping is faster since only 2 phases are needed for charging either the positive or negative output.Type: ApplicationFiled: June 16, 2004Publication date: February 3, 2005Applicant: PERICOM TECHNOLOGY (SHANGHAI) CO. LTD.Inventors: Paul Chan, Zhen Luo, Shun Wu, Jian Pan
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Publication number: 20040132174Abstract: A perfusion incubator having an incubation well assembly is provided. A peristaltic pump may supply medium from a medium supply and pass it through a medium conditioning unit before supplying the medium to the incubation well assembly. Each well assembly may have an upper portion and a lower portion, a medium inlet and a medium outlet. The medium inlet may be positioned at a mid point in the well and the medium outlet is positioned above the medium inlet. An embryo may reside in the lower portion of the well. The well assembly may be formed from a permeable material through which a gas, such as carbon dioxide and/or oxygen, can diffuse.Type: ApplicationFiled: September 15, 2003Publication date: July 8, 2004Inventors: Allan Joseph Hilling Smith, David Sean O'Brien, David Paul Michel, Paul Chan
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Patent number: 6627435Abstract: A perfusion incubator having a fluid conditioning unit (12), a well assembly (7) and a well assembly heating unit (14), a peristaltic pump (4) and a fluid collection unit (11). The well assembly has a number of wells (20, 21) each having a transparent lid (30) and a fluid inlet (26) and a fluid outlet (27). An illumination device (13) is under the well so that the cell being cultured in the well assembly can be observed by means of a microscope (15). Each fluid inlet (26) is positioned so as to allow a tangential entry of fluid to the well at a mid point in the well, and each fluid outlet (27) is above the fluid inlet with the cell to be cultured in a lower portion of the well so that flow of fluid in the well is formed into a vortex which tends to draw fluid from around the cell without direct flow over the embryo.Type: GrantFiled: March 28, 2001Date of Patent: September 30, 2003Assignees: William A. Cook Australia Pty. Ltd., Cook IncorporatedInventors: Paul Chan, Allan Joseph Hilling Smith, David Michel
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Publication number: 20030072267Abstract: In a wireless communications network, different service levels can be subscribed to by users of mobile stations for packet-switched communications, such as electronic mail, web browsing, text chat, packet-switched voice communications, and so forth. In one arrangement, two different levels are defined. For a first level, when there is no more data to send over a wireless interface between a mobile station and a wireless access system, a logical connection between the mobile station and wireless access system is released. However, at a second level, the logical connection between the mobile station and the wireless access system is not released until after a predetermined timed period from when a send buffer becomes empty, with the send buffer containing data for sending over the wireless interface. A benefit of releasing the logical connection after some predetermined wait period is that the delays associated with establishing another logical connection are reduced.Type: ApplicationFiled: October 12, 2001Publication date: April 17, 2003Inventors: Anit Lohtia, Paul Chan H. Tse, Isa B. Atallah
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Patent number: 6480718Abstract: A system and method for automatic frequency planning in a wireless communications network is disclosed. The method determines frequency isolation between a first and second cell of the wireless communication network. The method broadcasts a first frequency in the first cell and a second frequency in the second cell. A mobile unit operating in the first cell measures both the first and second frequencies and reports the measurements using a mobile assisted handoff (MAHO) procedure. In some embodiments, the mobile unit repeatedly measures and reports the first and second frequencies. The difference between the first and second frequency is stored in an isolation matrix and analyzed to determine the frequency isolation.Type: GrantFiled: July 12, 1999Date of Patent: November 12, 2002Assignee: Nortel Networks LimitedInventor: Paul Chan Ho Tse
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Publication number: 20020082033Abstract: A wireless communications system includes a mobile station and a base station system that are capable of communicating on the wireless links (uplink and downlink). The mobile station is capable of establishing a logical connection, such as a temporary block flow, on the uplink, while the base station system establishes a logical connection on the downlink. When either the mobile station or the base station system detects end of data transmission, a predetermined wait period is started during which the mobile station or base station system does not start a procedure to release the logical connection on the uplink or downlink.Type: ApplicationFiled: January 25, 2001Publication date: June 27, 2002Inventors: Anit Lohtia, Paul Chan H. Tse
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Publication number: 20010039045Abstract: A perfusion incubator having a fluid conditioning unit (12), a well assembly (7) and a well assembly heating unit (14), a peristaltic pump (4) and a fluid collection unit (11). The well assembly has a number of wells (20, 21) each having a transparent lid (30) and a fluid inlet (26) and a fluid outlet (27). An illumination device (13) is under the well so that the cell being cultured in the well assembly can be observed by means of a microscope (15). Each fluid inlet (26) is positioned so as to allow a tangential entry of fluid to the well at a mid point in the well, and each fluid outlet (27) is above the fluid inlet with the cell to be cultured in a lower portion of the well so that flow of fluid in the well is formed into a vortex which tends to draw fluid from around the cell without direct flow over the embryo.Type: ApplicationFiled: March 28, 2001Publication date: November 8, 2001Applicant: Cook IncorporatedInventors: Paul Chan, Allan Joseph Hilling Smith, David Michel
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Patent number: 5825015Abstract: A machine readable binary code includes a two-dimensional matrix of data cells (6) having a plurality of sides. A unique sub-array of data cells (1, 2, 3, 4) is positioned at the point of intersection of each pair of adjacent sides to define and uniquely identify each corner of the matrix.Type: GrantFiled: October 18, 1996Date of Patent: October 20, 1998Assignee: Electronic Automation LimitedInventor: John Paul Chan
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Patent number: 5375242Abstract: An improved compilation and linkage system for use in operating a computer to generate a cross-module optimized executable code file from a plurality of source files and object files. The source files are compiled to intermediate code files using a compiler sub-system. In the preferred embodiment of the present invention, the intermediate code files consist of intermediate language instructions that can be optimized for execution on a predetermined computer and a global symbol table. The compiler sub-system can also be used to generate conventional object code files if desired. A linkage sub-system is then used to cross-module optimize the code in a plurality of intermediate code files and link the resultant object code with any other object code files to generate the executable code file for execution on the computer in question.Type: GrantFiled: September 29, 1993Date of Patent: December 20, 1994Assignee: Hewlett-Packard CompanyInventors: Rajiv Kumar, Paul Chan
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Patent number: 5339419Abstract: A computer software compiler system and method for distributing a machine independent computer program, created on a native computer platform, to heterogeneous target computer platforms. The system is comprised of a producer component and one or more installer components. The producer component receives the machine independent computer program as input and generates a compiler intermediate representation in a machine independent manner according to an HPcode-Plus compiler intermediate language. The compiler intermediate representation is architecture neutral and represents an architecture neutral distribution format (ANDF). The compiler intermediate representation is distributed to heterogeneous target computer platforms where the installer components reside.Type: GrantFiled: June 25, 1990Date of Patent: August 16, 1994Assignee: Hewlett-Packard CompanyInventors: Paul Chan, Manoj Dadoo, Karl Pettis, Vatsa Santhanan
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Patent number: 5280613Abstract: A computer software compiler system and method for distributing a machine independent computer program, created on a native computer platform, to heterogeneous target computer platforms. The system comprises installer components which exist on heterogeneous target computer platforms. The installers receive a compiler intermediate representation of the machine independent computer program. The compiler intermediate representation is architecture neutral and represents an architecture neutral distribution format. The installers translate the compiler intermediate representation to object code representations according to an HPcode-Plus compiler intermediate language. The installers operate in a machine dependent manner such that the object code representations are architecture dependent, or machine dependent, on the target computer platforms.Type: GrantFiled: June 25, 1990Date of Patent: January 18, 1994Assignee: Hewlett-Packard CompanyInventors: Paul Chan, Manoj Dadoo, Karl Pettis, Vatsa Santhanan
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Patent number: 5276881Abstract: A computer software compiler system and method for distributing a machine independent computer program, created on a native computer platform, to heterogeneous target computer platforms. The system comprises a producer which receives the machine independent computer program as input and which generates compiler intermediate representation. The system operates in a machine independent manner according to an HPcode-Plus compiler intermediate language. Thus, the compiler intermediate representation is machine independent and represents an architecture neutral distribution format (ANDF). The compiler intermediate representation, being architecture neutral, can be distributed to heterogeneous target computer platforms. At the heterogeneous target computer platforms, the compiler intermediate representation can be translated in a machine dependent manner into object code representations such that the object code representations are architecture dependent, or machine dependent, on the target computer platforms.Type: GrantFiled: June 25, 1990Date of Patent: January 4, 1994Assignee: Hewlett-Packard CompanyInventors: Paul Chan, Manoj Dadoo, Karl Pettis, Vatsa Santhanam