Anushka C Drescher

6602425, Aug 5, 2003

Apr 5, 2002

10/118072

Ashok J. Gadgil - El Cerrito CA
Anushka Drescher - Berkeley CA

Water Health International, Inc. - El Cerrito CA

C02F 132

210744, 210748, 250434, 250430, 250438, 422 24

A low cost system for providing drinking water includes a feed water container with a simple ceramic filter covering an outlet of the feed water container. The preferred filter is generally cylindrically shaped with a bore extending partially therethrough, in a configuration commonly referred to as a âceramic candleâ filter in developing countries. Under force of gravity, feed water filters through the ceramic to a storage container below. The filtered water is irradiated with ultraviolet (UV) energy either as it flows or after collection in the storage container. In one embodiment, filtered water is temporarily collected in an intermediate holding tank, where it can be irradiated constantly on in batches and periodically released to the lower container. Filtration through ceramic provides clear water with a low UV extinction coefficient for more efficient UV disinfection. Additionally, gravity fed filtration through ceramic provides a slow rate of water flow and a consequently high UV dose for a given UV intensity.

6803587, Oct 12, 2004

Jan 10, 2002

10/043647

Ashok Gadgil - El Cerrito CA
Eduardas Kazakevicius - Vilnius, LT
Anushka Drescher - Berkeley CA

Waterhealth International, Inc. - Napa CA

A61L 110

250434, 250432 R

A device that permits the in-home UV treatment of drinking water such as tap water is disclosed. The device employs a bare low-energy UV lamp suspended below a reflector and above a free surface of water flowing within the device. The water is supplied from a tap or other store of drinking water and proceeds through the device by the force of gravity. The device itself is not pressurized. The flow of water within the device is exposed to UV radiation from the UV lamp and is disinfected as a result. In the illustrated embodiment, the device is of a small size to permit its use, for example, directly at a tap for drinking water within the home. The flow rate of the device is commensurate with the normal flow rate of tap water, preferably less than about 8 liters per minute. The lamp power for safely disinfecting the water can be less than 20 watts, and in the illustrated embodiment the lamp is a low-pressure Hg lamp.

6974958, Dec 13, 2005

Oct 12, 2004

10/982857

Ashok Gadgil - El Cerrito CA, US
Eduardas Kazakevicius - Vilnius, LT
Anushka Drescher - Berkeley CA, US

WaterHealth International, Inc. - Napa CA

A61L001/10

250434, 250432 R

A device that permits the in-home UV treatment of drinking water such as tap water is disclosed. The device employs a bare low-energy UV lamp suspended below a reflector and above a free surface of water flowing within the device. The water is supplied from a tap or other store of drinking water and proceeds through the device by the force of gravity. The device itself is not pressurized. The flow of water within the device is exposed to UV radiation from the UV lamp and is disinfected as a result. In the illustrated embodiment, the device is of a small size to permit its use, for example, directly at a tap for drinking water within the home. The flow rate of the device is commensurate with the normal flow rate of tap water, preferably less than about 8 liters per minute. The lamp power for safely disinfecting the water can be less than 20 watts, and in the illustrated embodiment the lamp is a low-pressure Hg lamp.

7217933, May 15, 2007

Dec 12, 2005

11/302417

Ashok Gadgil - El Cerrito CA, US
Eduardas Kazakevicius - Vilnius, LT
Anushka Drescher - Berkeley CA, US

WaterHealth International, Inc. - Lake Forest CA

A61L 1/10

250423R, 250434, 250428, 250435

A device that permits the in-home UV treatment of drinking water such as tap water is disclosed. The device employs a bare low-energy UV lamp suspended below a reflector and above a free surface of water flowing within the device. The water is supplied from a tap or other store of drinking water and proceeds through the device by the force of gravity. The device itself is not pressurized. The flow of water within the device is exposed to UV radiation from the UV lamp and is disinfected as a result. In the illustrated embodiment, the device is of a small size to permit its use, for example, directly at a tap for drinking water within the home. The flow rate of the device is commensurate with the normal flow rate of tap water, preferably less than about 8 liters per minute. The lamp power for safely disinfecting the water can be less than 20 watts, and in the illustrated embodiment the lamp is a low-pressure Hg lamp.

20020066874, Jun 6, 2002

Dec 4, 2000

09/730321

Anushka Drescher - Berkeley CA, US

G01J001/00

250/50400R

A portable ultraviolet light (UV) transmittance meter employs a UV lamp and UV sensor to measure the transmittance of a water sample. The level of UV radiation received when the sample is positioned between the UV sensor and the UV lamp is compared to a level received when a zeroing sample (blank) is positioned in the same location in the same vial. A ratio of the UV signals for the blank and sample is correlated to a transmittance level by a data correlation table or calibration curve. The value provided by the data correlation table is communicated to the user in the form of a transmittance range, within which the sample transmittance falls.

6419821, Jul 16, 2002

Feb 25, 2000

09/513799

Ashok J. Gadgil - El Cerrito CA
Anushka Drescher - Berkeley CA

WaterHealth International, Inc. - El Cerrito CA

C02F 132

210 86, 210748, 210109, 210138, 210143, 2101981, 210202, 210203, 2102571, 210261, 210262, 210209, 210256, 250430, 250434, 250438, 4221863

A low cost system for providing drinking water includes a feed water container with a simple ceramic filter covering an outlet of the feed water container. The preferred filter is generally cylindrically shaped with a bore extending partially therethrough, in a configuration commonly referred to as a âceramic candleâ filter in developing countries. Under force of gravity, feed water filters through the ceramic to a storage container below. The filtered water is irradiated with ultraviolet (UV) energy either as it flows or after collection in the storage container. In one embodiment, filtered water is temporarily collected in an intermediate holding tank, where it can be irradiated constantly on in batches and periodically released to the lower container. Filtration through ceramic provides clear water with a low UV extinction coefficient for more efficient UV disinfection. Additionally, gravity fed filtration through ceramic provides a slow rate of water flow and a consequently high UV dose for a given UV intensity.