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  Waste disposalUSPTO Application #: 20070298183Title: Waste disposal Abstract: A gaseous-liquid mixture for use with a pressurized spray container, said mixture being capable of forming solid foam of polymer in open air, wherein said mixture comprises a polymer, a highly volatile non-poisonous organic solvent, and a propellant gas, said mixture being prepared from powder of said polymer dissolved in said solvent, such that said foam solidifies in open air in about one minute or less. (end of abstract)
Agent: Nath & Associates - Alexandria, VA, US Inventor: Roy Barzik USPTO Applicaton #: 20070298183 - Class: 427427400 (USPTO) Related Patent Categories: Coating Processes, Spraying, Polymer Containing Coating Material The Patent Description & Claims data below is from USPTO Patent Application 20070298183. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] This invention relates to a device and method of disposal of solid waste, in particular pet excrements. BACKGROUND OF THE INVENTION [0002] Dogs are so important for human society. There is no doubt that dogs are the most important pets grown by people. Having dogs in private homes in modern, westernized society raises a serious problem: dogs have to be taken outside the homes several times a day for trips in the streets, in order to allow them to excrete and breath fresh air. Hygiene regulations in most of modern cities do not allow the owners of dogs to leave dogs excrements on the streets and even on park alleys and lawns. People who walk their dogs have to carry with them tools for collecting the dog excrements and put them in the garbage cans (e.g. the so called `pooper scooper` in the US). Carrying such tools whenever taking a dog to a trip outside, makes such trip unpleasant and uncomfortable. [0003] One would suggest dogs owners to carry with them plastic bags in which they should put their dog litter when it lays on the street. However the touch of the hand to the warm, humid dogs excrements even through a plastic bag is also very unpleasant and disgusting. U.S. Pat. No. 4,900,077 and U.S. Pat. No. 5,540,470 suggest portable mechanical devices which facilitate the scooping of litter, without touching it, into a disposable plastic bag. U.S. Pat. No. 4,718,707 discloses an entirely disposable waste scooper comprising a U-shaped wire frame, a plastic bag and a cardboard lid. These devices facilitate the scooping and disposal procedure but do not remove the unpleasant sensation. [0004] DE3333887 describes a spray container for excrement disposal containing quick hardening polymer composition. The sprayed composition forms a layer of cellular foam over the faeces such that it can be taken by hand and stored in a plastic bag provided with the same container. The patent application does not define specific components of the foam composition. The inventor states that the foam should harden in seconds and suggests employing well-known polyurethane and epoxy resin sprays used in industry for mounting window frames and the like. However, these polymers are formed in situ, by polymerization chemical reaction, which is known to take several minutes, even tens of minutes. [0005] DE19937983 describes foam for excrement disposal which creates stable isolation layer after the application and makes the faeces unrecognizable. The foam is applied from a spray container and becomes hard in less than 3 hours, preferably in 5 minutes. It is suggested that the excrement can be simply allowed to remain on the street, since the isolating layer remains stable even if a person steps in the excrement. The foam-forming fluid contains gelatin dissolved in alcohol and the propellant gas is CO.sub.2 or air. [0006] Hence, it is clear that so many dog owners are waiting and seeking an elegant solution to the problem described above, namely, how to get rid of dog excrements in an easy way, without carrying collection tools, plastic bags etc, and yet leaving the streets clean as demanded by the authorities. [0007] Similar and even more basic problems arise with other kinds of solid waste, which may be not only unpleasant but mechanically, biologically or chemically hazardous, when such waste is spilled in unprepared place or in unexpected way. SUMMARY OF THE INVENTION [0008] In accordance with the present invention, there is provided a spray container for disposal of solid waste, filled with pressurized gaseous-liquid mixture capable of forming solid foam in open air. The mixture comprises a polymer, a highly-volatile non-poisonous organic solvent, and pressurized gas. The solid foam has good adhesion to the waste and weak adhesion to hard solid surfaces and skin. The foam solidifies in the open air in about one minute or less. Preferably, the foam is formed with closed bubbles. [0009] In one embodiment of the present invention, the spray container is of pocket-size and is adapted to deliver multiple portions of foam. The foam solidifies in open air in about half a minute or less, whereby it is suitable for disposal of such solid waste as pet's excrements. Preferably, the container is adapted for being carried attached to a person's body or clothing, or to pet's walking accessories. For this purpose, the spray container may comprise means for attaching to belts, textile fabric (clothes), pet leash, pet collar, or pet leash reel. [0010] The spray container is preferably adapted to meter out portions of foam of limited predetermined quantity, and preferably this predetermined quantity is adjustable within a predetermined range. [0011] In accordance with another aspect of the present invention, there is provided gaseous-liquid mixture for use with the above spray container, for disposal of solid waste. The polymer in the mixture may be one or more of the group: polystyrene, PVC, rubber, polyethylene glycol nylons, polyesters, polycarbonate, and polyacrylate. The organic solvent may be one or more of the group: diethyl ether, ethyl acetate, ethanol, methylene chloride, acetone, freon, and three chloro ethane. The pressurized gas may be one or more of the group: carbon dioxide, butane, and propane. [0012] The gaseous-liquid mixture may be made up of PVC, methylene chloride and propane or carbon dioxide, for example in proportion 80 g of PVC, approximately 300 g of methylene chloride and 2 g of the pressurized gas. [0013] The gaseous-liquid mixture may be also prepared on the basis of polystyrene, acetone and carbon dioxide. [0014] Preferably, the gaseous-liquid mixture contains two polymers from the group: polystyrene, PVC, rubber, polyethylene glycol nylons, polyesters, polycarbonate, and polyacrylate, while the organic solvent is a mixture of at least two solvents, one polar solvent such as ethyl acetate, ethanol, or three chloro ethane, and one less polar solvent such as diethyl ether, or methylene chloride. [0015] The solidifying foam may contain antiseptic or germicide or deodorant additives; and/or it may contain surfactant additives to enhance forming of closed bubbles. [0016] In the specific embodiment for disposal of pet's excrements, the solidifying foam may further contain a substance-indicator of a predetermined chemical property or component of the pet's excrements, thereby allowing diagnostics of a medical condition. [0017] In accordance with yet another aspect of the present invention there is provided a method for disposal of hazardous and/or unpleasant solid waste in a waste-disposal container, the method comprising: [0018] providing a spray container loaded with pressurized gaseous-liquid mixture capable of forming solid foam in open air, the solid foam having good adhesion to the solid waste and weak adhesion to hard solid surfaces and skin; [0019] spraying a portion of the foam over the solid waste so that the solid waste is covered from all sides and forms an integral body with the foam; [0020] waiting a period of time necessary for the foam to solidify; and [0021] taking the integral body by fingers, touching only the foam portion, and placing it in said waste-disposal container. [0022] The present invention is an elegant solution to the problem of disposal of specific kinds of solid waste. In particular, using appropriate combinations of organic solvents, gases and polymeric species, it is possible to form mixtures that can be stored in small aerosol containers, thereby solving the problem of dog's excrements. When such mixture is sprayed out of the container on a dirty object, it forms a solid crust in a very short time. Then, the dirt can be immediately removed and be thrown to the closest garbage can, so that the user has no direct touch with it and has no need to watch over the excrement for an inconveniently long period of time. [0023] The solidifying foam may contain surfactant additives to enhance forming of closed bubbles. Such foam is a better insulator than material with communicating pores, does not absorb humidity and provides for more economical usage of the materials. [0024] It is possible to select materials that are cheap and environmentally friendly (e.g. most of commonly used thermoplastic polymers, alcohols and carbon dioxide). Hence, such a product can be distributed by any supermarket, shops for food, general supplies, pharmacies etc. [0025] The above method of waste disposal may be implemented in such facilities as operation rooms, biological and chemical laboratories where the solid waste may be not only unpleasant but mechanically, biologically or chemically hazardous, and may be spilled in unprepared place or in unexpected way as a result of breaking flasks, tubes, etc. Continue reading... Full patent description for Waste disposal Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Waste disposal patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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