Self-contained, self-powered electrolytic devices for improved performance in automatic dishwashing

• US 7,413,637 B2
• Filed: 08/16/2002
• Issued: 08/19/2008
• Est. Priority Date: 05/17/2002
• Status: Active Grant

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Price, Kenneth Nathan, Scheper, William Michael, Tremblay, Mario Elmen, Ballas, Julia Elizabeth
• Primary Examiner(s): Phasge; Arun S
• Application Number:
  US10/222,575
• Publication Number:
  US 20030213704A1
• Time in Patent Office: 2,195 Days
• Field of Search: 204/228.6, 204/229.2, 204/229.4, 204/229.6, 204/275.1, 204/276
• US Class Current: 204/275.1
• CPC Class Codes: A47L 15/4238 by using electrolytic cells
• CPC Class Codes: A47L 15/4291 Recovery arrangements, e.g. for the recovery of energy or water
• CPC Class Codes: A61L 2/035 Electrolysis
• CPC Class Codes: A61L 2/18 Liquid substances or solutions comprising solids or dissolved gases
• CPC Class Codes: A61L 2202/11 Apparatus for generating biocidal substances, e.g. vaporisers, UV lamps
• CPC Class Codes: C11D 17/003 Colloidal solutions, e.g. gels; Thixotropic solutions or pastes
• CPC Class Codes: C11D 2111/14 Hard surfaces
• CPC Class Codes: C11D 2111/44 Multi-step processes
• CPC Class Codes: C11D 2111/46 applying energy, e.g. irradiation
• CPC Class Codes: C11D 3/046 Salts
• CPC Class Codes: C11D 3/3953 Inorganic bleaching agents C11D3/3951 takes precedence
• CPC Class Codes: C11D 3/3956 Liquid compositions
• CPC Class Codes: Y02W 10/37 using solar energy

Abstract

An automatic dishwashing appliance comprising an unattached electrolytic device which comprises an unattached electrochemical cell capable of generating electrolyzed water in the wash and/or rinse cycle, and more particularly to the unattached electrolytic device itself, methods of use, and articles of manufacture.

Claims

1. An automatic dishwashing appliance comprising a washing compartment having a washing basin, a tableware rack located within the washing compartment, a first unattached electrolytic device located on the tableware rack and configured to treat tableware, a second, non-buoyant unattached electrolytic device at least partially immersed in a fluid in the washing basin, and injection openings coupled to a rotary nozzle disposed underneath the tableware rack, wherein the first unattached electrolytic device and the second, non-buoyant unattached electrolytic device provide an improvement in cleaning, sanitizing, and/or stain removal, and each comprises:

(a) a body comprising at least one inlet port for collecting an aqueous electrolytic solution provided by said washing basin;

(b) an electrochemical cell, located within said body, comprising at least one inlet opening and one outlet opening, and at least one pair of electrodes defining a cell gap comprising a cell passage formed therebetween through which said aqueous electrolytic solution can flow; and

(c) a source of electrical current supply for providing electrical current between said pair of electrodes;

wherein the injection openings are configured to deliver said aqueous electrolytic solution to the first unattached electrolytic device on the tableware rack.

2. An automatic dishwashing appliance according to claim 1, wherein said first unattached electrolytic device comprises an electrolytic composition comprising recirculated wash and/or rinse liquor provided by said appliance, and wherein at least some of said recirculated wash and/or rinse liquor is electrolyzed.

3. An automatic dishwashing appliance according to claim 1, wherein said gap between said at least one pair of electrodes has a gap spacing between about 0.1 mm to about 5.0 mm;

and wherein the operating voltage is between about 1 and about 12 volts.

4. An automatic dishwashing appliance according to claim 1, wherein said electrochemical cell is non-partitioned.

5. An automatic dishwashing appliance according to claim 1, wherein said unattached electrolytic device is disposable.

6. An automatic dishwashing appliance according to claim 1, wherein said electrochemical cell is replaceable.

7. An automatic dishwashing appliance according to claim 6, wherein said electromechanical cell is rechargeable via a refill and/or a replacement cartridge removable from said at least one compartment of said unattached electrolytic device.

8. An automatic dishwashing appliance according to claim 1, wherein said unattached electrolytic device further comprises a means for activating and/or deactivating said electrochemical cell at specific time intervals throughout the wash and/or rinse cycles of said appliance.

9. An automatic dishwashing appliance according to claim 8, wherein said means of activation and/or deactivation of said electrochemical cell is selected from among the group consisting of timer, sensor, and combinations thereof, and wherein said sensor is optionally capable of analyzing or detecting a composition of a fluid or gaseous environment of said unattached electrolytic device or within said appliance, and signaling said unattached electrolytic device to activate or deactivate said electrochemical cell.

10. An automatic dishwashing appliance according to claim 9, wherein when said fluid or gaseous environment of said unattached electrolytic device or within said appliance comprises a volatile compound or gas selected from the group consisting of perfumes, perfume raw materials, volatile organic compounds, gases comprising oxides of carbon, sulfur, or nitrogen, and mixtures thereof, and when said at least one sensor detects said volatile compound or gas in said unattached electrolytic device or within said appliance, said sensor electrically signals said unattached electrolytic device to activate or deactivate said electrochemical cell.

11. An automatic dishwashing appliance according to claim 1, further comprising a filtering means to minimize fouling of said electrochemical cell from the flow of said recirculated electrolytic solution through said cell passage.

12. An automatic dishwashing appliance according to claim 11, wherein said filtering means comprises a filter removably housed in or attached to said body, wherein said filter is disposable and/or replaceable.

13. An automatic dishwashing appliance according to claim 1, further comprising means for cell regeneration to extend the operating life of said at least one pair of electrodes by descaling or unfouling said at least one pair of electrodes.

14. An automatic dishwashing appliance according to claim 13, wherein said electrochemical cell regeneration means comprises a liquid electrode cleansing composition selected from the group consisting of an anticorrosion agent, descaling agent, and mixtures thereof, wherein said cell passage may further comprise said liquid electrode cleansing composition.

15. An automatic dishwashing appliance according to claim 1, wherein said electrochemical cell comprises a cathode of stainless steel and an anode of titanium, and wherein said anode is coated and/or layered with at least one of the materials selected from the group consisting of platinum, ruthenium, iridium, and oxides, alloys, and mixtures thereof.

16. An automatic dishwashing appliance according to claim 15, wherein said cell passage of said robust cell forms a gap between said at least one pair of electrodes having a gap spacing between about 0.1 mm to about 0.5 mm;

and wherein the operating voltage is between about 3 and about 6 volts.

17. An automatic dishwashing appliance according to claim 1, further comprising a cell regeneration means to extend the operating life of said at least one pair of electrodes by descaling or unfouling said at least one pair of electrodes.

18. An automatic dishwashing appliance according to claim 17, wherein said electrochemical cell regeneration means comprises periodic addition of a liquid electrode cleansing composition through said cell passage of said electrochemical cell, wherein said liquid electrode cleansing composition is selected from the group consisting of an anticorrosion agent, descaling agent, and mixtures thereof said unattached electrolytic device.

19. An automatic dishwashing appliance according to claim 18, wherein said liquid electrode cleansing composition is vinegar.

20. An automatic dishwashing appliance according to claim 17, wherein said electrochemical cell regeneration means comprises a means for periodically reversing the polarity of said at least one pair of electrodes.

21. An automatic dishwashing appliance according to claim 1, wherein said source of electrical current supply is achieved by one or more rechargeable electrical batteries.

22. An automatic dishwashing appliance according to claim 21, further comprising at least one sealed or sealable compartment wherein said battery is integrated within said unattached electrolytic device via said at least one sealed or sealable compartment.

23. An automatic dishwashing appliance according to claim 1, wherein said discharge effluent is released outside the device through said outlet port by means of a pump located within said unattached electrolytic device.

24. An automatic dishwashing appliance according to claim 23, further comprising at least one additional and separate, scaled or sealable compartment, wherein said pump is housed in said separate compartment within said unattached electrolytic device.

25. An automatic dishwashing appliance according to claim 1, wherein a discharge effluent is released outside said unattached electrolytic device and into said washing basin of said appliance through said outlet port by gravity flow.

26. An automatic dishwashing appliance according to claim 1, further comprising a storage means for storing at least one product prior to its release.

27. An automatic dishwashing appliance according to claim 26, wherein said storage means comprises at least one sealed or sealable compartment in said unattached electrolytic device for containing said at least one product, such that said at least one product is released in conjunction with at least one predetermined point in time during the wash and/or rinse cycle of said appliance, wherein said at least one sealed or sealable compartment can house at least one product in the form selected from the group consisting of a tablet, free-flowing gel, free-flowing powder, free-flowing liquid, or combinations thereof, and wherein said at least one compartment is recloseable such that the compartments contents are not contaminated by an external medium.

28. An automatic dishwashing appliance according to claim 27, further comprising at least one replaceable component, wherein said at least one product is in the form of a product refill or replacement cartridge.

29. An automatic dishwashing appliance according to claim 27, wherein said means to ensure that the compartment'"'"'s contents are not contaminated by an external medium is a one-way valve which allows products to flow outside but avoids contamination of the interior of said compartment from an outside medium.

30. An automatic dishwashing appliance according to claim 29, further comprising at least one replaceable component, comprising said one-way valve in the form of a disposable and/or replaceable elastomeric slit valve.

31. An automatic dishwashing appliance according to claim 26, wherein said at least one product comprising said aqueous electrolytic solution selected from the group consisting of chloride ions, chlorite ions, water-soluble salts having the formula (M)_x(XO₂)_y and/or (M)_x(X)_y wherein X is Cl, Br, or I and wherein M is a metal ion or cationic entity and wherein x and y are chosen such that said salt is charge balanced, electrolysis precursor compounds, electrolysis precursor salts with low water solubility, electrolysis precursor compounds contained within a medium or matrix for controlled release, electrolyzed water, detergent compositions, rinse aid compositions, electrode cleaning agents, bleach-scavenging agents, metal-protecting agents, adjunct ingredients, and mixtures thereof.

32. An automatic dishwashing appliance according to claim 31, wherein said bleach-scavenging agent or said metal-protecting agent is selected from the group consisting of perborate, percarbonate, ascorbic acid or derivatives thereof, carbamate, ammonium, sulfite, bisulfite, aluminum tristearate, sodium silicate, benzotriazole, amines, amino acids, and mixtures thereof.

33. An automatic dishwashing appliance according to claim 26 wherein said at least one product is not contained within a resealable compartment but rather is in direct fluid contact with wash and/or rinse liquors for at least some period of time during operation of said appliance.

34. An automatic dishwashing appliance according to claim 1, wherein said unattached electrolytic device further comprises means for communicating to the consumer when it is time to refill or replace said electrochemical cell cartridge.

35. An automatic dishwashing appliance according to claim 34 wherein said communication means comprises an indicator for communicating to the consumer when it is time to refill or replace said electrochemical cell cartridge.

36. An automatic dishwashing appliance according to claim 1, wherein said unattached electrolytic device further comprises a disposable and/or replaceable self-contained source of chloride or chlorite ions.

37. An appliance according to claim 1, wherein said appliance is a commercial dishwasher selected from the group consisting of conveyor-low-temperature type, cabinet-low-temperature type, and combinations thereof.

38. according to claim 37, wherein said source of electrical current supply is the building electrical outlet, wherein said device comprises a power cord and plug for connection to said electrical outlet to allow for higher levels of bleaching species to be generated.

39. according to claim 38, wherein disinfectancy can be achieved in the wash and/or rinse liquor at water temperatures below 48°

C.