David Thanh Ho

US Patent:

D482710, Nov 25, 2003

Filed:

Nov 25, 2002

Appl. No.:

29/171573

Inventors:

David Gian-Teh Ho - Diamond Bar CA 91765

International Classification:

1606

US Classification:

D16132

US Patent:

7336433, Feb 26, 2008

Filed:

May 23, 2006

Appl. No.:

11/439624

Inventors:

David Gian-Teh Ho - Diamond Bar CA, US

International Classification:

G02B 7/02
G02B 27/30
G01B 11/26

US Classification:

359823, 359641, 359826, 356153

Abstract:

A laser collimator includes an optical lens having an optical axis; a sliding lens holder for housing the lens having a longitudinal opening parallel to the optical axis; a stationary lens holder ring for fitting to the front of the sliding lens holder and having a protruding key for receiving the longitudinal opening; and a focusing ring movable along the optical axis, wherein the protruding key placed within the longitudinal opening prevents the sliding lens holder from rotating.

US Patent:

7377556, May 27, 2008

Filed:

Nov 2, 2005

Appl. No.:

11/266653

Inventors:

David Gian-Teh Ho - Diamond Bar CA, US

International Classification:

F16L 19/00

US Classification:

285338, 2853825

Abstract:

An adapter mount for attaching to a fitting tube includes an adapter tube having an outer circumferential surface; a first expandable ring placed on the outer circumferential surface of the adapter tube and comprising of elastic material for expanding and fitting to the inner surface of the fitting tube; an adjustment ring configured to be threaded to the adapter tube to generate a rotational threading force; a compression ring for translating the rotational threading force from the adjustment ring to a longitudinal compressing displacement of the first expandable ring, causing an outer surface of the first expandable ring to fit to the inner surface of the fitting tube; and a stop attached to the adapter tube for preventing the adjustment ring from separating from the adapter tube.

US Patent:

7862744, Jan 4, 2011

Filed:

Jul 23, 2008

Appl. No.:

12/178527

Inventors:

David Losan Ho - Los Angeles CA, US
Zhenghao Wan - Wyuishan, CN

Assignee:

Mamtek International Limited - Hong Kong

International Classification:

C09K 3/00
C07H 17/02
C07H 1/00
C07H 1/06
B01D 11/00
B01D 21/01
B01D 37/00

US Classification:

25218212, 536 172, 536124, 536127, 210634, 210734, 210767, 210770

Abstract:

The present invention provides a method for preparing DMF for sucralose production, including, e. g. , isolating DMF from a composition comprising DMF, water, and methanol, using a single-tower rectification system. In various embodiments of the present invention, the composition, after the removal of water and methanol, may be further dried/dehydrated, such as, by using a dehydration agent and/or filtration. The resulting substantially pure DMF may comprise at least about 98-99% DMF. The present invention further provides a method of preparing a composition comprising anhydrous sucrose for sucralose production, which may comprise mixing regular sucrose with a water-containing DMF composition, and drying the resulting sucrose-DMF composition. Also provided is a single-tower separation system for isolating DMF from a composition comprising DMF, water, and methanol.

US Patent:

7931308, Apr 26, 2011

Filed:

Apr 17, 2008

Appl. No.:

12/105182

Inventors:

David Gian-Teh Ho - Diamond Bar CA, US

International Classification:

F16L 19/00

US Classification:

285338, 285346, 42119, 359829

Abstract:

An adapter clamp for clamping an adapting tube. The adapter clamp includes: an adapter tube; a first resilient ring placed in the inner circumferential surface of the adapter tube and including elastic material for expanding inward and clamping to the outer surface of the adapting tube; a hollow adjustment ring configured to be threaded to the inner surface of the adapter tube to generate a displacement force; and a compression ring providing minimum friction resistant for translating the displacement force from the threading hollow adjustment ring to a longitudinal compressing displacement of the first resilient ring, causing an inner surface of the first resilient rings to fit to the outer surface of the adapting tube. The adapter clamp also includes a second resilient ring placed in the inner circumferential surface of the adapter tube; and a spacer placed on the inner circumferential surface of the adapter tube.

US Patent:

8186069, May 29, 2012

Filed:

Mar 23, 2010

Appl. No.:

12/730111

Inventors:

David Gian-Teh Ho - Diamond Bar CA, US

International Classification:

G01B 11/26

US Classification:

33286, 33228, 356154

Abstract:

A laser collimator for collimating optical elements of a viewing device, such as a telescope. The laser collimator includes three or more lasers positioned on a plane in front of the optical elements of the viewing device for generating three or more respective incident laser beams directed towards the optical elements to simulate a large aperture coherent light; a reflecting mirror positioned at an eyepiece of the viewing device for reflecting the three or more incident laser beams; and a target display on the same plane or a plane parallel to the plane on which the three or more lasers are positioned for displaying the three or more incident laser beams reflected from the reflecting mirror and the optical elements of the viewing device, as three or more respective dots.

US Patent:

8258291, Sep 4, 2012

Filed:

Oct 25, 2006

Appl. No.:

11/552789

Inventors:

David Losan Ho - Los Angeles CA, US
Wan Zhenghao - Wyuishan, CN

Assignee:

Mamtek International Limited - Hong Kong

International Classification:

C07H 1/00
C07H 5/02

US Classification:

536124, 536122

Abstract:

In one embodiment of the invention a method to prepare sucralose-6 -acylate through chlorinating sucrose-6-acylate by BTC in the process of sucralose preparation is disclosed. In this embodiment a Vilsmeier reagent is firstly prepared below 0 C. by dissolving BTC in DMF or in component solvent, containing DMF, toluene, dichloroethane, chloroform and carbon tetrachloride. Consequently, sucrose-6-ester was chlorinated by Vilsmeier reagent. BTC can also be dissolved in one or several organic solvent such as toluene, dichloroethane, chloroform and carbon tetrachloride, and added to a DMF solution of sucrose-6-acylate for chlorination. Sucralose was prepared through de-esterifying the obtained sucralose 6-ester using sodium methoxide/methanol or sodium ethoxide/ethanol.

US Patent:

20040259641, Dec 23, 2004

Filed:

Apr 21, 2004

Appl. No.:

10/828903

Inventors:

David Ho - Huntington Beach CA, US

International Classification:

G06F017/00
G06F019/00

US Classification:

463/042000

Abstract:

An interactive Internet-based reality game where participants, via an interactive website, create a publicly viewable profile in a server database that may contain such information as a photo of the participant and an accompanying paragraph of self-written text. The object of the game of the present invention is to get as many people as possible to look at the participant's profile thereby increasing his number of points. Points represent a scoring system related to the amount of public exposure a participant has received. The more people who view a participant's profile, the more exposure that participant will have and the more points he or she will accumulate. The result of playing this game is that the participant's image and thoughts can become widely known to a great number of other people.