Duc N Doan

US Patent:

6860286, Mar 1, 2005

Filed:

Jul 14, 2003

Appl. No.:

10/618308

Inventors:

Duc T. Doan - Los Angeles CA, US

International Classification:

F16L005/00

US Classification:

137357, 73197, 73201

Abstract:

A water supply system for an apartment complex can include individual hot water conduits and cold water conduits for each apartment. Each conduit includes a water meter that enables the owner of the apartment complex to accurately determine the hot water usage and cold water usage of each apartment tenant. The meter system can also be used to locate leakage points in the water supply system, e. g. dripping faucets or continuously running toilets.

US Patent:

6985073, Jan 10, 2006

Filed:

Dec 20, 2004

Appl. No.:

11/015893

Inventors:

Duc Doan - Los Angeles CA, US

International Classification:

B60Q 1/00

US Classification:

3404255, 340457, 340474, 356218

Abstract:

The invention provides traffic safety apparatus including light-to-frequency converters for monitoring the status of traffic signals and tail lights of same lane close proximity preceding vehicles and when dangerous or potentially dangerous conditions are detected, visually and/or audibly providing an alert signal to the driver. The monitored information can be real-time recorded in the drivers vehicle and if desired, transmitted by wireless to off-vehicle receivers. Recording the information in the vehicle establishes an operational history that can be important for such uses as accident reconstruction, whereas information transmitted by wireless can be recorded by entities such as law enforcement, thereby adding an additional measure of traffic safety as well as providing documentation of driving infractions.

US Patent:

20050280514, Dec 22, 2005

Filed:

Jun 21, 2004

Appl. No.:

10/871633

Inventors:

Duc Doan - Los Angeles CA, US

International Classification:

B60Q001/00
G08B001/08

US Classification:

340425500, 340438000, 340539100

Abstract:

An information assembly for monitoring vehicular operational parameters that contributes to dangerous vehicular operation. The driver of the vehicle may also be monitored. The assembly includes a microprocessor for data analysis to determine driver and vehicular operational anomalies. An information display area is installed interior of the vehicle to be viewable by the driver, and at least one display unit installed to be viewable exterior of the vehicle. The display viewable by exterior observers can be installed on the vehicle or at some other convenient location. Wireless transmission capabilities are included for exterior display of the processed information.

US Patent:

20070290515, Dec 20, 2007

Filed:

Jun 15, 2006

Appl. No.:

11/452575

Inventors:

Duc T. Doan - Los Angeles CA, US

International Classification:

B60R 19/40

US Classification:

293119

Abstract:

There is provided apparatus for protection of a vehicle from damage by other vehicles attempting to undesirably encroach to the front or rear of the vehicle. The apparatus includes extendable and retractable bumper portions that when extended form a safety enclosure for activities at the rear of a vehicle. The apparatus includes sensors for monitoring encroaching objects and may be electrically or hydraulically operated, either automatically or upon demand.

US Patent:

20080153602, Jun 26, 2008

Filed:

Dec 26, 2006

Appl. No.:

11/645179

Inventors:

Duc Doan - Los Angeles CA, US

International Classification:

F41B 15/00
A47G 29/10

US Classification:

463 474, 206229, 2064591

Abstract:

A hand wielded weapon including a flexible elongated lanyard with connector means for receiving an innocuous container and keys and/or other objects, the container configured for releasably dispensing upon sufficient impact a selected substance capable of marking for identification of, distracting, and/or temporarily incapacitating, an assailant. The lanyard provides increased length for distancing the user from the assailant when using the weapon.

US Patent:

42337666, Nov 18, 1980

Filed:

Feb 6, 1978

Appl. No.:

5/875392

Inventors:

Duc Doan - Los Angeles CA

International Classification:

G09F 320

US Classification:

40336

Abstract:

A telephone mounting stand or display holder includes a base member having a plug for tight fitting frictional engagement into the finger sockets of a standard telephone and includes vertically extending support members supporting a generally outwardly opening U-shaped display holding frame having a plurality of slots for receiving and holding sheets of display material. The holder includes a hand grip of a similar configuration to that of the standard telephone formed in the base member, substantially co-extensive with the finger sockets of the standard telephone and further includes a business card holding rack of the back side thereof.

US Patent:

41005570, Jul 11, 1978

Filed:

May 12, 1977

Appl. No.:

5/796128

Inventors:

Duc Doan - Los Angeles CA

International Classification:

G03B 1308
A42C 500

US Classification:

354225

Abstract:

A visor optical camera viewing system for sighting a camera for taking candid photographs includes a visor mounted mirror utilized in combination with a vertically oriented viewing screen on a camera for permitting a photographer to hold the camera at waist level and sight the camera in any direction from side to side or ahead while having the head and eyes turned straight ahead. This arrangement permits the taking of candid photographs without the subject being aware of the taking of the picture.

US Patent:

D3704505, Jun 4, 1996

Filed:

Apr 28, 1995

Appl. No.:

D/038086

Inventors:

Duc Doan - Los Angeles CA

US Classification:

D12193