Keming W Yeh

6516035, Feb 4, 2003

Apr 7, 2000

09/545229

Lichen Wang - Watsonville CA
Keming W. Yeh - Fremont CA

ActiSys Corporation - Fremont CA

H04B 1404

375253, 370449, 341 60

A method includes a data encoding scheme that has a run length limit of (1,6) and a 25% duty cycle. With error correction, the method achieves an effective run length limit of (2,9). The method can be used in conjunction with a packetized communication protocol to allow multiple controllers to communicate with multiple peripheral devices in a wireless data network. Peripheral devices include pointing devices, keyboards and game pads.

6999008, Feb 14, 2006

Oct 21, 2002

10/277462

Lichen Wang - Watsonville CA, US
Keming Yeh - Fremont CA, US
Siew Ming Yong - Johor, MY

ACTiSYS, Corporation - South Fremont CA

H03K 17/94

341 22, 345168, 345169, D14317

A versatile and mobile keyboard and a highly energy efficient keyboard scanning method are provided. The keyboard may be used with a variety of mobile devices such as PDAs, cellular phones, and tablet PCs, through various interfaces such as an IR, USB, or Bluetooth™ interface. In particular, an IR head assembly is provided that includes an IR head, a movable arm on which the IR head is mounted, and a connector for attaching to a docking structure. The docking structure may be attached to a keypad, which is electrically coupled to the IR head for transmitting keystroke data through the IR head. When a mobile device is docked on the docking structure, the arm in the IR assembly may be moved to an optimal distance from the IR port of the mobile device to ensure high communication performance between the keyboard and the mobile device. An energy efficient keyboard scanning method utilizes higher-valued pull-up resistors for energy conservation. The keyboard scanning method includes a charging step to charge stray capacitance associated with the keys.

7450031, Nov 11, 2008

Nov 18, 2005

11/282281

Lichen Wang - Watsonville CA, US
Keming Yeh - Fremont CA, US

Actisys Corporation - Fremont CA

H03K 17/00

341 26, 341 22

A versatile and mobile keyboard and a highly energy efficient keyboard scanning method are provided. The keyboard may be used with a variety of mobile devices such as PDAs, cellular phones, and tablet PCs, through various interfaces such as an IR, USB, or Bluetooth™ interface. In particular, an IR head assembly is provided that includes an IR head, a movable arm on which the IR head is mounted, and a connector for attaching to a docking structure. The docking structure may be attached to a keypad, which is electrically coupled to the IR head for transmitting keystroke data through the IR head. When a mobile device is docked on the docking structure, the arm in the IR assembly may be moved to an optimal distance from the IR port of the mobile device to ensure high communication performance between the keyboard and the mobile device. An energy efficient keyboard scanning method utilizes higher-valued pull-up resistors for energy conservation. The keyboard scanning method includes a charging step to charge stray capacitance associated with the keys.

7479902, Jan 20, 2009

Apr 26, 2006

11/411315

Lichen Wang - Watsonville CA, US
Keming Yeh - Fremont CA, US
Siew Ming Yong - Johor, MY

ACTISYS Corporation - Fremont CA

H03M 11/00

341 22, 345169

A versatile and mobile keyboard and a highly energy efficient keyboard scanning method are provided. The keyboard may be used with a variety of mobile devices such as PDAs, cellular phones, and tablet PCs, through various interfaces such as an IR, USB, or Bluetooth™ interface. In particular, an IR head assembly is provided that includes an IR head, a movable arm on which the IR head is mounted, and a connector for attaching to a docking structure. The docking structure may be attached to a keypad, which is electrically coupled to the IR head for transmitting keystroke data through the IR head. When a mobile device is docked on the docking structure, the arm in the IR assembly may be moved to an optimal distance from the IR port of the mobile device to ensure high communication performance between the keyboard and the mobile device. An energy efficient keyboard scanning method utilizes higher-valued pull-up resistors for energy conservation. The keyboard scanning method includes a charging step to charge stray capacitance associated with the keys.

20040075589, Apr 22, 2004

Jul 30, 2003

10/631942

Lichen Wang - Watsonville CA, US
Keming Yeh - Fremont CA, US
Siew Yong - Johor, MY

H03M011/00
H03K017/94

341/022000

A versatile and mobile keyboard and an advantageous wireless data transmission method are provided. The keyboard may be used with a variety of mobile devices such as PDAs, cellular phones, and tablet PCs, through various interfaces such as an IR, USB, or Bluetooth™ interface. In particular, an IR head clamp assembly is provided that includes an IR head and a clamp body for attaching to a mobile device proximate the IR port of the mobile device. Advantageously, the IR head clamp assembly ensures high communication performance between the keyboard and the mobile device. The wireless data transmission method of the present invention is efficient and advantageously prevents erroneous characters from being displayed.

20060071820, Apr 6, 2006

Nov 18, 2005

11/282889

Lichen Wang - Watsonville CA, US
Keming Yeh - Fremont CA, US

H03M 11/00
H03K 17/94

341022000

A versatile and mobile keyboard and a highly energy efficient keyboard scanning method are provided. The keyboard may be used with a variety of mobile devices such as PDAs, cellular phones, and tablet PCs, through various interfaces such as an IR, USB, or Bluetooth™ interface. In particular, an IR head assembly is provided that includes an IR head, a movable arm on which the IR head is mounted, and a connector for attaching to a docking structure. The docking structure may be attached to a keypad, which is electrically coupled to the IR head for transmitting keystroke data through the IR head. When a mobile device is docked on the docking structure, the arm in the IR assembly may be moved to an optimal distance from the IR port of the mobile device to ensure high communication performance between the keyboard and the mobile device. An energy efficient keyboard scanning method utilizes higher-valued pull-up resistors for energy conservation. The keyboard scanning method includes a charging step to charge stray capacitance associated with the keys. The keyboard scanning method can also be operated at a variable scanning frequency.

57869219, Jul 28, 1998

Aug 12, 1996

8/695481

Li-Chen Wang - Watsonville CA
Keming Yeh - Fremont CA

ActiSys Corporation - Fremont CA

H04B 1024

359152

An IR interface device is connected over a wired port to a host computer, so as to provide an IR communication link between the host computer and another computing device capable of IR communication. Such an IR interface device may also include a coupling to a printer device. An IR conference device allows communication between devices using different IR communication protocols by providing individual IR communication links to each of the communicating devices and passing data between the individual IR communication links. An IR transceiver integrated circuit with automatic gain control is provided.

44008660, Aug 30, 1983

Apr 5, 1982

6/365859

Keming W. Yeh - Los Angeles CA
Izya Bol - Hawthorne CA

Xerox Corporation - Stamford CT

H01L 2124

29571

A semiconductor structure and particularly a high-speed VLSI self-aligned Schottky Metal Semi-Conductor Field Effect Transistor having a relatively high operating frequency and low series resistance, predicated upon very controllable small structure geometries made by the growth of oxide bumper insulators on either side of the schottky barrier. The oxide bumpers width is relatively thicker than the depth of the initial silicon dioxide layer on the substrate surface thereby providing effective separation of the gate from the source and drain respectively. Accordingly, spatial separations between the self-aligned gate-and-drain and gate-and-source can be relatively very closely controlled by varying the doping level of an intermediate polysilicon layer thereby providing controllable differential polysilicon oxidation rates for the bumpers. Thus, the series resistance can be controlled to be relatively low thereby providing a VLSI SASMESFET device that can be operated at relatively high speeds.