Xiaohui Yang

US Patent:

6750768, Jun 15, 2004

Filed:

Sep 4, 2002

Appl. No.:

10/235167

Inventors:

Xiaohui Yang - Cupertino CA
Arthur Fuss - Studio City CA

Assignee:

WG Security Products, Inc. - San Jose CA
EAS Sensor Sense - Van Nuys CA

International Classification:

G08B 1314

US Classification:

340571, 3405681, 3405721, 3405724

Abstract:

According to the invention, a system and method of reducing noise interference in a way that employs pseudorandom coding. A transmitter and receiver are provided to send and receive a string of non-periodic pulses. The string of non-periodic pulses can be a sequence of pseudorandom codes. The random transmission of pulses in a non-periodic manner promotes a significant immunity to periodic interferences of constant noise operating in a surveillance area. The string of non-periodic pulses can be mutually spaced and binary, in the form of 0 or 1, and can include several bits per cycle to measure the mean and standard deviation of the string of non-periodic pulses received. A circuit is coupled to the transmitter and receiver for comparing the portion of the string of non-periodic pulses received with the string of non-periodic pulses transmitted; and whereby an alarm in triggered if the portion of the string of non-periodic pulses is above a threshold value.

US Patent:

6753821, Jun 22, 2004

Filed:

Sep 4, 2002

Appl. No.:

10/235225

Inventors:

Xiaohui Yang - Cupertino CA
Arthur Fuss - Studio City CA

Assignee:

WG Security Products, Inc. - San Jose CA

International Classification:

H01Q 1112

US Classification:

343742, 343867, 3405727

Abstract:

An antenna system for an electronic article surveillance system, comprising: a first antenna and a second antenna, the first antenna and the second antenna mounted for use in a substantially overlapping manner, the first antenna configured as a loop, the second antenna configured in a âfigure-8â; a control circuit for selectively activating one of the first and second antennas. The first and second antennas each operate as a transmit and receive antenna. The control circuit further comprises a switch to selectively enable operation of one of the antennas when the other is open circuit. One of the antennas transmits and receives while the other is open circuit, and vice versa. The loop antenna substantially detects markers oriented substantially perpendicular to an elongated axis when entering into a surveillance area. The âfigure-8â antenna substantially detects markers oriented substantially parallel to an elongated axis when entering into a surveillance area.

US Patent:

20090160644, Jun 25, 2009

Filed:

Dec 22, 2007

Appl. No.:

11/963829

Inventors:

Xiaohui YANG - Los Altos CA, US

Assignee:

WG Security Products Inc. - San Jose CA

International Classification:

G08B 13/14

US Classification:

340571

Abstract:

Active tags are disclosed. According to one aspect of the present invention, an active tag is made similar to a shell in shape. The tag includes two parts, one is referred to as a cover and the other one is referred to as a base. The base includes a trigger tip (e.g., a reset switch) that is engaged when the two parts are closed. In an exemplary application, the needle of the cover part goes through a piece of garment and is engaged into the cover. These two parts can be disengaged by a detacher that is typically controlled by a casher (e.g., at point of sale). One of the important features in the present invention is that the tag is active, which means the shell tag will set off an alarming audio if disengaged improperly or without authorization.

US Patent:

D478828, Aug 26, 2003

Filed:

Sep 4, 2002

Appl. No.:

29/166866

Inventors:

Xiaohui Yang - Cupertino CA
Arthur Fuss - Studio City CA

Assignee:

WG Security Products, Inc. - San Jose CA
EAS Sensor Sense - Van Nuys CA

International Classification:

1005

US Classification:

D10104

US Patent:

D478829, Aug 26, 2003

Filed:

Sep 4, 2002

Appl. No.:

29/166892

Inventors:

Xiaohui Yang - Cupertino CA
Arthur Fuss - Studio City CA

Assignee:

WG Security Products, Inc. - San Jose CA
EAS Sensor Sense - Van Nuys CA

International Classification:

1005

US Classification:

D10104