Hand-held ultraviolet water purification system

• US 6,110,424 A
• Filed: 02/23/1999
• Issued: 08/29/2000
• Est. Priority Date: 01/27/1997
• Status: Expired due to Term

• Current Assignee: Katadyn North America, Inc. (Katadyn Holding AG)
• Original Assignee: Hydro-Photon Incorporated (Katadyn Holding AG)
• Inventors: Watkins, Robert, Maiden, Miles
• Primary Examiner(s): MCKANE, ELIZABETH L
• Application Number:
  US09/256,054
• Time in Patent Office: 553 Days
• Field of Search: 422/24, 250/432 R, 250/433, 250/455.11, 250/504 H, 210/748, 210/241
• US Class Current: 210/748.11
• CPC Class Codes: C02F 1/325 Irradiation devices or lamp constructions
• CPC Class Codes: C02F 2201/009 Apparatus with independent power supply, e.g. solar cells, windpower or fuel cells
• CPC Class Codes: Y02A 20/212 Solar-powered wastewater sewage treatment, e.g. spray evaporation
• CPC Class Codes: Y10S 422/905 Miscellaneous liquid sterilization means

Abstract

A hand-held water purification system includes a pen-light sized ultraviolet lamp that is enclosed in a quartz cover and is powered by a battery and associated ballast circuitry. The battery and ballast circuitry are connected to the lamp by switches that are under the control of a liquid-level sensor. The sensor connects the battery, the ballast circuitry and the lamp once the sensor determines that the ultraviolet lamp is fully immersed in the water. If the container that holds the water is relatively large, the lamp and quartz cover end of the system are used to stir the water, to ensure that all of the water comes sufficiently close to the ultraviolet lamp.

Claims

1. A method of purifying a batch of unsterilized water that is held in a container, the method including the steps of:

A. immersing an ultraviolet light source and associated ultraviolet transmissive cover that extend from a first end of the system in the batch of unsterilized water;

B. sensing that the light source is immersed fully in the unsterilized water;

C. turning the light source on to emit ultraviolet radiation in the batch of unsterilized water in the container, the radiation purifying the water.

2. The method of claim 1 further including the step of agitating the water by stirring the water with the first end of the system.

3. The method of claim 1 further including the step of turning the light source off a predetermined time after the light source is turned on.

4. A method of purifying water that is held in a container, the method including the steps of:

A. immersing an ultraviolet light source and an associated ultraviolet transmissive cover that form one end of a water purification system in the water to be purified;

B. turning the light source on to emit ultraviolet radiation in the water; and

C. agitating the water by stirring the water with the light source and cover end of the system, the radiation from the light source purifying the water.

5. The method of claim 4 further including the step of sensing that the light source is immersed fully in the water before turning on the light source.

6. The method of claim 4 further including the step of turning the light source off a predetermined time after the light source is turned on.

7. A hand-held system for purifying unsterilized water, the system including:

A. a drinking container having at one end an opening through which water both enters and exits the container and a second closed end for holding the water in the container;

B. a case with an outwardly extending ultraviolet light source, the light source for submerging in the unsterilized water that is held in the drinking container and providing ultraviolet emissions that purify the unsterilized water,

C. control means for turning the light source on and off, the control means being contained in the case.

8. The system of claim 7 further including a liquid-level sensor that prevents the light source from turning on until the light source is immersed in water.

9. The system of claim 8 further including a timing circuit that turns the light source off a predetermined time after the sensor allows the light source to turn on.

10. The system of claim 8 wherein the means for turning on the light source includes a battery.

11. The system of claim 10 wherein the battery is rechargeable and the system further includes a battery charger.

12. A method of purifying water that is held in a container, the method including the steps of:

A. immersing an ultraviolet light source and an associated ultraviolet transmissive cover that form one end of a water purification system in the water to be purified;

B. turning the light source on to emit ultraviolet radiation in the water to purify the water; and

C. agitating the water to expose all of the water in the container to the ultraviolet radiation.

13. The method of claim 12 further including the step of sensing that the light source is immersed fully in the water before turning on the light source.

14. The method of claim 12 further including the step of turning the light source off a predetermined time after the light source is turned on.

15. The method of claim 12 wherein the step of agitating the water includes agitating the water with the immersed ultraviolet light source.

16. A hand-held water purification system for purifying unsterilized water in batches, the system including:

A. an ultraviolet light source;

B. an ultraviolet transmissive cover that fits over the light source;

C. power means for supplying power to the light source; and

D. a case that contains the power means and connects to the ultraviolet transmissive cover to form a water-tight enclosure for the ultraviolet light and the power means.

17. The system of claim 16 further including a liquid-level sensor that prevents the light source from turning on until the light source is immersed in water.

18. The system of claim 17 further including a timing circuit that turns the light source off a predetermined time after the sensor turns the light source on.

20. The system of claim 16 wherein the power means includes a battery and an associated ballast circuit.

21. The system of claim 16 wherein the case includes

a. a first section and a second section that separate to provide access to the power means, and

b. sealing means for making a water-tight seal between the first and second sections.

22. The system of claim 21 wherein the sealing means is a gasket.

23. The system of claim 16 further including in the case a control means for switching the ultraviolet light source on to purify a batch of unsterilized water and thereafter switching the light source off.

19. The system of claimed 17 wherein:

a. the battery is rechargeable; and

b. the system further includes a battery charger.

24. A hand-held system for purifying unsterilized water, the system including:

A. a case with an outwardly extending ultraviolet light source, the light source for submerging in the unsterilized water and providing ultraviolet emissions that purify the unsterilized water,

B. control means for turning the light source on and off, the control means being contained in the case.

C. an ultraviolet transmissive cover that fits over the ultraviolet lamp and connects to the case in a water-tight manner to protect the lamp and the control means from the water.

25. The system of claim 24 wherein the control means includes

a. a switch;

and

b. a timer for operating the switch to turn the light source off a predetermined time after the light source turns on.

26. A method of purifying a batch of unsterilized water that is held in a container, the method including the steps of:

A. immersing an ultraviolet light source and an associated ultraviolet transmissive cover that form one end of a water purification system in the batch of unsterilized water that is held in the container;

B. turning the light source on to emit ultraviolet radiation in the batch of unsterilized water in order to sterilize the water;

C. turning the light source off; and

D. removing the light source from the batch of water held in the container.

27. The method of claim 26 wherein the step of turning the light source off further includes turning the light source off a predetermined time after turning the light source on.