Ken W Lau

7670032, Mar 2, 2010

Feb 8, 2008

12/069298

Ken M. Lau - Pacifica CA, US

F21V 17/02
G03B 15/06

362322, 362 17, 362 18, 362346, 3592251, 3592262

A diffuser-reflector assembly for use with a photographic flash lamp () comprises, in one aspect, an elastic base () having rigid first inserts ( and ), two arms ( and ), a shaft (), a pivot assembly (), and one or more frames () that hold second inserts (). The diffuser-reflector assembly installs slidably onto the light-emitting end of a flash lamp (). The second inserts can have various optical properties. They can be specular or diffuse reflectors, color or neutral density filters, or a combination. The frames and inserts can be swung on the arms and independently pivoted over a wide range of angles above the lamp, thereby providing a wide range of lighting effects. The frames and arms are held in place by friction and can be adjusted by manual force. The entire assembly can be made of simple parts that snap together.

60022604, Dec 14, 1999

Sep 23, 1997

8/935638

Ken Lau - San Francisco CA
Rodger Mayeda - Cottonwood CA
Julian Riccomini - Pleasanton CA
Mary Ilyin - Walnut Creek CA

Pacific Gas & Electric Company - San Francisco CA

G01R 3108

324522

A fault sensor suitable for use in a heterogenous power distribution system executes a stored program and causes sufficient information to be collected to distinguish a source of fault current as being from a public utility portion of the power distribution network or from a distributed generator. Short circuit current and magnetizing current are reliably distinguished based on differences in VI "signatures. " In addition, the fault sensor periodically senses a condition of a battery of the fault sensor. When the condition of the battery indicates the battery power is low, the fault sensor sends a digital data signal including a low battery indication to a remote location. Subsequent to occurrence of a sustained power outage, the sensor detects that power has been restored and sends to a remote location a digital data signal including an indication that power has been restored. The sensor periodically measures peak line voltage and peak line current and reports peak values to the remote location.

55657834, Oct 15, 1996

Aug 2, 1995

8/510505

Ken Lau - San Francisco CA
Jimmie Yee - Danville CA
Rodger Mayeda - Danville CA
Julian Riccomini - Pleasanton CA
Mary Ilyin - Walnut Creek CA

Pacific Gas and Electric Company - San Francisco CA

G01R 3108
G08B 2100

324522

A method and a fault sensor device (1) which can detect and distinguish abnormal current and voltage events on an alternating current overhead and underground transmission line or distribution line (2). The fault sensor device (1) is contained in an elongated molded plastic housing (4), The fault sensor device (1) includes a current sensor (12) and a voltage sensor (14) connected in proximity to the transmission or distribution line (2) for monitoring current and voltage analog signals; an analog-to-digital converter (22) connected to the current and voltage sensors (12,14) for sampling the current and voltage analog signals and producing: corresponding digital signals; a processor (11) responsive to the digital signals for detecting an abnormal condition and distinguishing whether any of a plurality of types of faults has occurred; and a transmitter (3) for transmitting the fault information from the processor (11) to a remote location.

56569319, Aug 12, 1997

Jan 20, 1995

8/376145

Ken Lau - San Francisco CA
Jimmie Yee - Danville CA
Rodger Mayeda - Danville CA
Julian Riccomini - Pleasanton CA
Mary Ilyin - Walnut Creek CA

Pacific Gas and Electric Company - San Francisco CA

G01R 3102

324522

A fault current sensor device detects and distinguishes abnormal current events on alternating current overhead and underground power transmission lines. The sensor distinguishes whether the momentary or sustained fault is a line-to-ground fault, line-to-line fault or a three-phase fault. The sensor determines whether the overload has occurred on all three phases, or only on one or two phases, of the power line in an unbalanced situation. The device can be remotely reprogrammed to alter its trigger or threshold level and can be remotely reset after a fault has occurred.