Christopher Aston Chen

US Patent:

6385710, May 7, 2002

Filed:

Feb 23, 1996

Appl. No.:

08/605881

Inventors:

Gary S. Goldman - San Jose CA
Christopher Chen - Danville CA
Douglas W. Forehand - Mountain View CA

Assignee:

Sun Microsystems, Inc. - Palo Alto CA

International Classification:

G06F 1200

US Classification:

711169, 711168, 711170, 711161, 711211, 3642328, 364238

Abstract:

In accordance with the present invention, a cache memory subsystem includes a processor, a cache control unit and a SRAM serving as the cache memory. The SRAM is a synchronous SRAM. The cache control unit provides appropriately timed control signals to the SRAM when the processor is accessing the cache memory. The SRAM can be either a pipelined architecture SRAM (register output SRAM) or a flow-through access architecture SRAM (latch output SRAM). The cache control unit is selectably configured to operate in a pipelined mode (1-1-1) or a flow-through (2-2) mode. The cache control unit is configured in the 1-1-1 mode when the SRAM is a pipelined architecture SRAM having a clock rate equal to the processor. When the SRAM is a flow-through architecture SRAM that cannot be clocked at the same rate as the processor, the cache control unit is configured in the 2-2 mode and the SRAM is clocked at a clock rate half of the processor clock rate.

US Patent:

20020032656, Mar 14, 2002

Filed:

Mar 27, 2001

Appl. No.:

09/818824

Inventors:

Christopher Chen - Los Angeles CA, US

International Classification:

G06F017/60

US Classification:

705/043000

Abstract:

A method and a system for providing automatic teller machine (“ATM”) services to the customers of multiple financial institutions where the financial institutions contract with an ATM services provider. The ATM services provider providing multiple ATM's which are connected to an electronic funds transfer network. In an exemplary embodiment, the contracting financial institutions pay fees to the services provider in return for the services provider providing the financial institutions' customers with reduced or no cost ATM access. By contracting out the same set of ATMs to multiple financial institutions, the ATM services provider reduces duplicate ATM costs incurred when each financial institution maintains its own ATM network. Preferably, each of the ATMs of the ATM services provider has similar distinguishing characteristics or “trade dress” so as to make the ATM services provider's ATMs readily distinguishable from other ATMs. The ATM services provider may maintain a database of information about the customers and financial institutions including, but not limited to, the account numbers, the financial institution identification numbers, the transaction histories, and the contractual arrangements for determining the amount of reduced fees to be charged to the financial institutions and their customers. The service provider's ATMs may provide all conventional ATM transactions including, but not limited to, withdrawals of cash, inquiries of account balances, transfers of balances, and deposits of monies and checks.

US Patent:

20050152338, Jul 14, 2005

Filed:

Jan 14, 2004

Appl. No.:

10/758350

Inventors:

Christopher Chen - San Francisco CA, US
Victor Zhao - San Francisco CA, US

International Classification:

H04L012/66

US Classification:

370352000

Abstract:

A system and method for managing voice communications routes a first telephone call from a remote source to a remote destination using a second telephone call. The first telephone call is made through a first network, which may be one of a circuit switching network and a packet switching network, while the second telephone call is made through a second network, which is one of the circuit and packet switching network that differs from the first network. The second telephone call is initiated in response to the first telephone call. The first and second telephone calls are then interconnected to connect the remote source to the remote destination.

US Patent:

20050152347, Jul 14, 2005

Filed:

Jan 14, 2004

Appl. No.:

10/757904

Inventors:

Christopher Chen - San Francisco CA, US
Victor Zhuo - San Francisco CA, US

International Classification:

H04L012/66

US Classification:

370356000, 370401000

Abstract:

A system and method for managing voice communications utilizes a switching unit to selectively interconnect signal paths between a telephone, a circuit switching network and a packet switching network at the premises of a telephone line subscriber to selectively route telecommunication signals between the telephone, the circuit switching network and the packet switching network. Thus, the switching unit allows one or more telephone calls to be established through the circuit switching network and/or through the packet switching network.

US Patent:

20050260975, Nov 24, 2005

Filed:

May 19, 2004

Appl. No.:

10/848954

Inventors:

Christopher Chen - San Francisco CA, US
Victor Zhuo - San Francisco CA, US

International Classification:

H04B001/38
H04M001/00

US Classification:

455415000, 455567000, 455426100

Abstract:

A telecommunications system and method for providing a notification of the availability of a target communication device to receive a call monitors the target communication device to effectuate a generation of a notification signal at a calling communication device when the target communication device is available to receive a call. The monitoring of the target communication device may involve receiving the latest status information of the target communication device from a network, such as a Voice over Internet Protocol (VoIP) network or a cellular telephone network.

US Patent:

20220374737, Nov 24, 2022

Filed:

May 24, 2021

Appl. No.:

17/328451

Inventors:

- San Francisco CA, US
Shravan SUNKADA - Kensington CA, US
Christopher CHEN - San Francisco CA, US
John SEARS - Berkeley CA, US

International Classification:

G06N 5/04
G06N 20/00
G07C 5/00
G06F 16/29

Abstract:

The disclosed embodiments provide techniques for scoring a driver or vehicle. In one embodiment, a method is disclosed comprising receiving metrics associated with a vehicle; generating a deviation vector based on the metrics and a plurality of aggregated values corresponding to the metrics; computing a driver update value based on the deviation vector and a plurality of model parameters, each of the plurality of model parameters corresponding to the metrics; and computing a driver score based on the driver update value, a previous score, and a learning rate.

US Patent:

20200213186, Jul 2, 2020

Filed:

Mar 12, 2020

Appl. No.:

16/817174

Inventors:

- San Francisco CA, US
Anthony Roberts - San Francisco CA, US
Berk D. Demir - Menlo Park CA, US
Christopher Chen - Portland OR, US

International Classification:

H04L 12/24
H04L 12/931
H04L 12/26
H04L 12/947

Abstract:

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for detecting sources of computer network failures. One of the methods includes identifying a network flow in a computer network between a source and a destination; performing a first probe to determine whether there is end-to-end connectivity between the source and the destination; in response to determining that there is no end-to-end connectivity between the host and the destination, performing one or more additional probes including a second probe to determine whether each hop in the path of the network flow between the source and the destination is operational including requesting that the source transmit a respective first trace diagnostic packet to each hop in the path of the network flow; and determining whether at least one link of the computer network that is part of the path of the network flow has failed based on the results.

US Patent:

20190149398, May 16, 2019

Filed:

Nov 10, 2017

Appl. No.:

15/809836

Inventors:

- San Francisco CA, US
Anthony Roberts - San Francisco CA, US
Berk D. Demir - Menlo Park CA, US
Christopher Chen - Portland OR, US

International Classification:

H04L 12/24
H04L 12/26
H04L 12/947

Abstract:

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for detecting sources of computer network failures. One of the methods includes identifying a network flow in a computer network between a source and a destination; performing a first probe to determine whether there is end-to-end connectivity between the source and the destination; in response to determining that there is no end-to-end connectivity between the host and the destination, performing one or more additional probes including a second probe to determine whether each hop in the path of the network flow between the source and the destination is operational including requesting that the source transmit a respective first trace diagnostic packet to each hop in the path of the network flow; and determining whether at least one link of the computer network that is part of the path of the network flow has failed based on the results.