Peter J Chang

US Patent:

D455619, Apr 16, 2002

Filed:

Aug 17, 2000

Appl. No.:

29/128047

Inventors:

Peter J. Chang - Rockville MD 20852

International Classification:

0805

US Classification:

D 8 141

US Patent:

7073687, Jul 11, 2006

Filed:

Jul 23, 2003

Appl. No.:

10/625150

Inventors:

Peter J. Chang - Rockville MD, US

International Classification:

B67D 5/52

US Classification:

222137, 2221455, 222326

Abstract:

An front catch plate for manual, pneumatic or battery powe-operated dual-barrel dispensing guns of the type having a pair of laterally-displaced and adjustable plunger shafts with end-mounted pistons for extruding compound from both cartridges of a variety of sizes of twin cartridge packs. In one embodiment, the front catch plate accepts the cartridge neck from an opening on the top side of the front catch plate. A plastic insert is attached to the front catch plate and provides a custom fit base for the specific form, shape and size of the cartridge neck used. There is a separate plastic insert for each different commercially available dual cartridge. In this embodiment, the front catch plate will generally be manufactured as one piece with the carriage. In another embodiment, the front catch plate accepts the cartridge neck from an opening on the side of the front catch plate. After the cartridge neck is inserted into the front catch plate opening, a adjustable centering stop is then inserted onto the front catch plate to secure the cartridge neck in place for application.

US Patent:

7127769, Oct 31, 2006

Filed:

Jul 11, 2003

Appl. No.:

10/617512

Inventors:

Peter J. Chang - Rockville MD, US
Albert S. Lee - Clarksville MD, US

International Classification:

A46B 15/00
A47L 13/02

US Classification:

15105, 151055, 1523601, 425458, D8 19, D8 45

Abstract:

An improved multi-purpose caulk finishing tool incorporating a clip (or locking slots) for attaching the tool to a caulking gun and means for storing caps for caulking material. The present invention is held and carried unobtrusively on a conventional caulking gun. Means are also provided for storing caps, for resealing caulking material cartridges, within the caulk finishing tool.

US Patent:

7398899, Jul 15, 2008

Filed:

May 26, 2005

Appl. No.:

11/138623

Inventors:

Peter J. Chang - Rockville MD, US
Albert Lee - Clarksville MD, US

International Classification:

D67D 5/42

US Classification:

222391, 16430

Abstract:

A pair of sure-grip inserts formed as molded rubber sheathes for use in conjunction with a caulking gun having a downwardly protruding trigger that is retracted by hand to dispense caulk, and a downwardly protruding stationary handle to provide a hand grip for retracting the trigger. The trigger insert formed as an open-ended molded rubber sheath with a particular contoured shape and an internal channel conforming to the trigger for slidable insertion thereon. The handle insert is likewise formed as an open-ended molded rubber sheath conforming to the handle for slidable insertion thereon. The inserts are molded per a two-color double-injection-molding process to provide an aesthetically striking two-color appearance, and they are molded with a particular contoured design that conforms to the hand, thereby improving comfort during hard, extended use. The contour plus the use of soft-durometer thermoplastic rubber gives a high-coefficient of friction for a vastly improved grip under all (even wet) conditions.

US Patent:

7649569, Jan 19, 2010

Filed:

May 24, 2005

Appl. No.:

11/135724

Inventors:

Peter Chang - Hurst TX, US
Rajitha Padakanti - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04N 9/475

US Classification:

348512, 348516, 348521, 348497

Abstract:

System and method for digitally correcting time base errors in video display systems. A preferred embodiment comprises 1) correcting time base errors in a first portion of a horizontal line of video information, wherein the first correcting makes use of an error estimate for the horizontal line of video information and a preceding horizontal line of video information, 2) correcting time base errors in a second portion of a horizontal line of video information, wherein the second correcting makes use of an error estimate for the horizontal line of video information, and 3) repeating the first correcting and the second correcting for remaining horizontal lines of video information in the digitized video signal.

US Patent:

8056879, Nov 15, 2011

Filed:

Feb 13, 2009

Appl. No.:

12/370604

Inventors:

Peter Chang - New York NY, US

International Classification:

A47G 1/24

US Classification:

248478, 248468, 359872

Abstract:

A high precision mirrormount comprises a retaining plate retaining reflecting mirror; an adjusting plate behind the retaining plate; a retaining ball fixed between the retaining plate and the adjusting plate; a fine-adjusting plate installed at the backside of the adjusting plate; a tension shaft fixed to the adjusting plate and exposing out of the fine-adjusting plate; tension springs being installed around the tension shaft; a first adjusting screw serving to coarsely adjust the adjusting plate to move closer or far away from the retaining plate; and a second adjusting screw having one end resisting against an elastic element which has an elastic coefficient of the elastic element being very smaller than those of the tension springs. Thus, the second adjusting screw has an effect of fine adjustment. In 2D case, two above structures are formed along an X axis and a Y axis respectively.

US Patent:

20100104252, Apr 29, 2010

Filed:

Oct 29, 2008

Appl. No.:

12/260091

Inventors:

Peter Chang - New York NY, US

International Classification:

G02B 6/46

US Classification:

385134

Abstract:

A mechanical nanomover for optical elements alignment comprises a platform; a front supporting block and a rear supporting block; a left metal sheet and a right metal sheet installed between the two supporting blocks; a movable block installed between the two metal sheets; a weak spring and a strong spring which are interacted with the movable block. A translation stage serves to drive the weak spring to drive the movable block. The elastic coefficient of the strong spring is much greater than that of the weak spring so that the larger displacement of the weak spring will induce only a small displacement of the movable block due to the interaction of the strong spring. No electric power is needed to drive the structure of the nanomover. The mechanical nanometer can provide a sufficient precision to the operation, while it is very inexpensive.

US Patent:

6290101, Sep 18, 2001

Filed:

Sep 1, 2000

Appl. No.:

9/653830

Inventors:

Peter J. Chang - Rockville MD

International Classification:

B67D 552

US Classification:

222137

Abstract:

A stabilizing plate for a dual-barrel dispensing gun of the type having a pair of laterally-displaced and adjustable plunger shafts with end-mounted pistons for extruding compound from twin cartridge packs. The stabilizing plate spans both plunger shafts rearwardly of the pistons and engages both sides of a twin cartridge pack seated in the dual-barrel, thereby aligning the cartridge pack relative to the plunger shafts during use. This helps to maintain a proper mix ratio from both sides of said twin cartridge pack. The stabilizing plate is formed with side-by-side apertures to pass the plunger rods of the dispensing gun. The front face of the stabilizing plate is defined by radial centering channels. More specifically, two sets of radial centering channels are provided, one set on each side of the stabilizing plate (each set corresponding to a plunger shaft), and each set being a series of circular channels of increasing diameter. Preferably, the stabilizing plate has two or more channels on each side respectively sized to seat any from among the group of 750 ml, 300 ml, 150 ml, 150 ml, and 75 ml capacity cartridges of a twin cartridge pack.