Charles H Chung

US Patent:

6900386, May 31, 2005

Filed:

Jun 20, 2003

Appl. No.:

10/464995

Inventors:

Charles N. Chung - South El Monte CA, US

International Classification:

H01H009/02
B65D006/28
H01R013/46
H02G003/08

US Classification:

174 48, 174 50, 174 58, 220 402, 361643

Abstract:

An end plate includes a plate member having a main flange extended from a front edge thereof for biasing against a front side of a mounting surface and a guider slot provided on the plate member for communicating an interior of a switch box to outside, and a side cover, which is overlapped on the plate member, including a holding catch extended from an edge of the side cover to mount on the plate member. A side locker includes a side flange for facing towards the rear side of the mounting surface and a driving axle connected to the holding catch of the side cover to drive the side flange towards to the main flange for biasing against the rear side of the mounting surface. Therefore, the wall is sandwiched between the main flange and the side flange to rigidly support the switch box on the mounting surface.

US Patent:

D525946, Aug 1, 2006

Filed:

Jun 13, 2003

Appl. No.:

29/183463

Inventors:

Charles N. Chung - South El Monte CA, US

International Classification:

1303

US Classification:

D13152

US Patent:

7964794, Jun 21, 2011

Filed:

Dec 11, 2007

Appl. No.:

12/001677

Inventors:

Charles N. Chung - South El Monte CA, US

International Classification:

H01H 9/02
H02G 3/12

US Classification:

174 58, 174 50, 174 53, 174481, 220 32, 220 33, 248906

Abstract:

An outlet box arrangement having an adjustable capacity for receiving electric outlets includes an outlet box having a side wall, a top wall and bottom wall extending therefrom defining an outlet socket. A top flange and bottom flange extending from the top wall and bottom wall, respectively, on which flange mounting holes are provided for enabling the outlet box to assemble with an outlet box cover for protecting the electric outlets installed in the outlet socket. Further, the outlet box is adapted to assemble with another in an edge-to-edge manner by securing the flange mounting holes of the two outlet boxes with fasteners, thereby expanding the outlet socket to receive additional electric outlets.

US Patent:

20040251043, Dec 16, 2004

Filed:

Jun 14, 2004

Appl. No.:

10/868569

Inventors:

Charles Chung - South El Monte CA, US

International Classification:

H02G003/08

US Classification:

174/050000

Abstract:

A modular gangable switch box is selectively formed by at least a box modular, wherein each box modular includes an upper panel and a lower panel to define a socket therebetween for receiving a switch assembly in the socket. A side locker is provided on each side end of the upper and lower panels of the box modular for connecting with another box modular in such a manner that the switch box having a desired number of sockets is capable of being formed by selectively connecting the box modulars together.

US Patent:

20210091747, Mar 25, 2021

Filed:

Dec 2, 2020

Appl. No.:

17/109827

Inventors:

- Goleta CA, US
Carolyn Bianco - San Francisco CA, US
Charles Chung - San Francisco CA, US

International Classification:

H03H 9/17
H03H 3/02
H01L 41/29
H03H 9/13
H03H 9/02

Abstract:

Acoustic resonator devices and methods are disclosed. An acoustic resonator device includes a substrate having a front surface and a cavity, a perimeter of the cavity defined by a lateral etch-stop comprising etch-stop material. A back surface of a single-crystal piezoelectric plate is attached to the front surface of the substrate except for a portion of the piezoelectric plate that forms a diaphragm that spans the cavity. An interdigital transducer (IDT) is formed on the front surface of the single-crystal piezoelectric plate such that interleaved fingers of the IDT are disposed on the diaphragm. The piezoelectric plate and the IDT are configured such that a radio frequency signal applied to the IDT excites a primary shear acoustic mode in the diaphragm.

US Patent:

20200412328, Dec 31, 2020

Filed:

Jun 26, 2020

Appl. No.:

16/913417

Inventors:

- Goleta CA, US
Carolyn Bianco - San Francisco CA, US
Charles Chung - San Francisco CA, US

International Classification:

H03H 9/17
H03H 9/13
H03H 9/02
H03H 3/02
H01L 41/29

Abstract:

Acoustic resonator devices and methods are disclosed. An acoustic resonator device includes a substrate having a front surface and a cavity, a perimeter of the cavity defined by a lateral etch-stop comprising etch-stop material. A back surface of a single-crystal piezoelectric plate is attached to the front surface of the substrate except for a portion of the piezoelectric plate that forms a diaphragm that spans the cavity. An interdigital transducer (IDT) is formed on the front surface of the single-crystal piezoelectric plate such that interleaved fingers of the IDT are disposed on the diaphragm.

US Patent:

20200412329, Dec 31, 2020

Filed:

Sep 11, 2020

Appl. No.:

17/019049

Inventors:

- Goleta CA, US
Carolyn Bianco - San Francisco CA, US
Charles Chung - San Francisco CA, US

International Classification:

H03H 9/17
H03H 9/02
H03H 9/13
H01L 41/29
H03H 3/02

Abstract:

Methods of fabricating acoustic devices are disclosed. A lateral etch stop is formed in a substrate. A back surface of a piezoelectric plate is attached to a front surface of the substrate. A conductor pattern is formed on the front surface of the piezoelectric plate, the conductor pattern including interleaved fingers of an interdigital transducer (IDT). A cavity is etched in the substrate using an etchant introduced through one or more openings in the piezoelectric plate. A lateral extent of the cavity is defined by the lateral etch stop. After etching the cavity, a portion of the piezoelectric plate forms a diaphragm spanning the cavity with the interleaved fingers of the IDT disposed on the diaphragm.

US Patent:

20180353323, Dec 13, 2018

Filed:

Sep 7, 2016

Appl. No.:

15/757829

Inventors:

Charles Chung - San Francisco CA, US

International Classification:

A61F 6/04

Abstract:

A homogeneous material layer comprising a base layer and at least one effective layer is disclosed. The material layer is made of a first material characterized by a bulk modulus of elasticity. The effective layer is defined by a plurality of projections that project from the base layer. Each projection includes a stalk and a cap having an end face. The height-to-width aspect ratio of the stalks is selected such that the effective layer has an effective modulus of elasticity that is lower than the bulk modulus of elasticity. The arrangement of the projections is selected such that the end faces are spaced along at least one dimension by a spacing that is less than or equal to one millimeter, thereby controlling the fine roughness of the effective surface. Control of the effective modulus and the spacing of the end faces enables control of the feel of the effective layer.