Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 4285819 | Functional magnetic microspheres Functional magnetic particles are formed by dissolving a mucopolysaccharide such as chitosan in acidified aqueous solution containing a mixture of ferrous chloride and ferric chloride. As the pH of the solution is raised magnetite is formed in situ in the... | 08/25/1981 |
| 4280984 | Isotope separation An isotope separation apparatus comprises a plurality of independent developing units, each comprising 2 to 20 adsorbent-packed columns forming a continuous developing circuit or passageway, and the developing units are connected to at least one common ma... | 07/28/1981 |
| 4276177 | High efficiency filtration with impurity concentration and ultrafiltration rejection flow recirculation The rejection flow from a water ultrafiltration system is passed through a filtration means for removal of bacteria, viri, pyrogens, and colloids, the effluent of which is reintroduced into the affluent presented to the ultrafiltration surface. Treatment ... | 06/30/1981 |
| 4276180 | Industrial waste-water reuse by selective silica removal over activated alumina Industrial waste-water, particularly cooling water containing water conditioning chemical additives, which heretofore has been discharged to the environment as blowdown because of high silica content, may now be treated for selective silica removal to con... | 06/30/1981 |
| 4267159 | Cyanide recovery Spent aqueous liquor containing cyanide, as from ore treatment, is passed through a bed of suitable anion-exchange resin to segregate the cyanide, which is subsequently recovered in regeneration of the resin by weak alkaline solution. Both the eluted cyan... | 05/12/1981 |
| 4267057 | Water treatment for selective removal of nitrates Water is treated to selectively remove substantially all of the nitrates present. This selective removal of nitrates is accomplished by adjusting the pH of the water to be treated, if necessary, to a pH of less than 8, and then passing the pH-controlled w... | 05/12/1981 |
| 4235712 | Removal of anionic surfactants from water A method of removing specific water-soluble anionic surfactants from water is disclosed. Briefly, the method comprises forming an emulsion by adding a nonionic surfactant and a hydrocarbon to the water and anionic surfactant. The emulsion is broken, with ... | 11/25/1980 |
| 4231864 | Process for preparation of a water for hemodialysis, and its application in renal hemodialysis The invention concerns a process for preparation of a water for hemodialysis, particularly renal hemodialysis, and consists of fixing the acetate anions (CH3 COO-) on at least one water-insoluble anion-exchange resin contained in a c... | 11/04/1980 |
| 4230565 | Method for purifying phosphate containing waste waters Process for purifying phosphate containing waste waters in which aluminum oxide is used as the sorption material. The waste water is brought into contact with fine-grained aluminum oxide in a grain size range from 0.05 to 0.2 mm. Simultaneously, a gas is ... | 10/28/1980 |
| 4207184 | Process for the purification of industrial effluents A process for purifying industrial effluents, wherein said effluents are brought into contact with a polymer adsorption material which is in the form of a solvated, preferably hydrated, gel.... | 06/10/1980 |
| 4206048 | Process for purification of contaminated water A process for removing nitrate ions from a contaminated aqueous feed solution containing the same, and also chloride ion, by forcing the solution through a reverse osmosis membrane which permits passage of nitrate ions through the membrane and into the pr... | 06/03/1980 |
| 4200612 | Process for recovering acids and zirconium contained in pickling solutions A process for recovery of zirconium from pickling solutions which have been used to treat products formed of zirconium or zirconium-based alloys, the invention particularly provides for separating zirconium from the acids contained in such solutions. The ... | 04/29/1980 |
| 4199449 | Removal of bacteria This invention relates to an ion exchange column for the removal of bacteria from a liquid medium wherein the column has, as an indicator to indicate when the column capacity for removal of bacteria is exhausted, a filter having submicron pores which will... | 04/22/1980 |
| 4186086 | Weak base ion exchange resins of a polyalkylenepolyamine and polyepoxide The cured reaction product of a polyalkylenepolyamine and a polyepoxide is useful as a weak base ion exchange resin. For example, the reaction of triethylenetetramine and diglycidyl ether of bisphenol A forms a weak base resin having an excellent total we... | 01/29/1980 |
| 4177140 | Method for removing a weak acid from an aqueous solution A method for removing a weak acid from an aqueous solution containing said acid is disclosed. The method comprises contacting said aqueous solution with an anion exchanger containing both strongly basic and weakly basic groups, said exchanger having a mat... | 12/04/1979 |
| 4147623 | Hydroxylamine purification via ion exclusion A process for separating hydroxylamine from an aqueous solution thereof also containing salts of cations whose corresponding free bases have base dissociation constants greater than 10-7. Said solution is brought to a pH of 6-11 and is passed t... | 04/03/1979 |
| 4134861 | Nitrate selective amidine ion exchange resins Water swellable ion exchange resins comprising a polymeric matrix and amidine groups are described together with their synthesis. The preferred amidine groups are nitrate selective and methods of selectively removing nitrate from water are also described.... | 01/16/1979 |
| 4134831 | Method for lake restoration A process for removing pollutants or minerals from lake, river or ocean sediments or from mine tailings is disclosed. Magnetically attractable collection units containing an ion exchange or sorbent media with an affinity for a chosen target substance are ... | 01/16/1979 |
| 4125594 | Purification of hydrofluoric acid etching solutions with weak anion exchange resins A method for purifying a spent hydrofluoric acid etching solution containing siliceous by-products which comprises treating the solution with a weak anion exchange resin of the polyamine type to remove SiF6= ions therefrom is describ... | 11/14/1978 |
| 4125550 | Removal of free fatty acids from water immiscible fluids via ion exchange resins Certain anion exchange resins are used for the removal of free fatty acids from water immiscible fluids. This anion exchange system can function without the necessity of organic solvents and with the resin in a hydrous state.... | 11/14/1978 |
| 4098691 | Purification of water for boiler Ozone is dispersed in river water to be purified and used in a high pressure boiler. The ozone selectively degrades large organic molecules, dissolved in the water, which ordinarily will irreversibly foul the strongly basic anion attracting resin used to ... | 07/04/1978 |
| 4097376 | Process for the purification of industrial effluents A novel process for purifying industrial effluents which comprises bringing said effluents into contact with cellulosic absorbent which has been pretreated with precipitants.... | 06/27/1978 |
| 4080290 | Method for removing phosphates from aqueous solutions A method for the selective removal of phosphates from an aqueous solution wherein the solution containing phosphates is brought into contact with a water insoluble phosphate-adsorbing complex which consists of multivalent metal ions and organic ligands wh... | 03/21/1978 |
| 4046750 | Ionene modified small polymeric beads Linear ionene polyquaternary cationic polymeric segments are bonded by means of the Menshutkin reaction (quaternization) to biocompatible, extremely small, porous particles containing halide or tertiary amine sites which are centers for attachment of the ... | 09/06/1977 |
| 4017358 | Boron thermal regeneration system An ion exchanger which allows flow in both directions along a selected flow-path. A separator plate divides the exchanger tank into two chambers each of which has a flow-conduit so that flow may enter or leave from either chamber while prohibiting the res... | 04/12/1977 |
| 3983220 | Recovery of boric acid from ion exchangers The recovery of boric acid from an anion exchange resin is improved by eluting the boric acid with an aqueous solution of ammonium bicarbonate. The boric acid can be readily purified and concentrated by distilling off the water and ammonium bicarbonate. T... | 09/28/1976 |
| 3961034 | Method of removing sodium thiosulfate from a hydrosulfite reaction mixture Filtrate from a formate-sodium hydrosulfite preparation contains valuable amounts of sodium formate and sodium bisulfite, which are raw materials for the synthesis of sodium hydrosulfite. The filtrate also contains sodium thiosulfate which is a known cata... | 06/01/1976 |
| 3959130 | Process for decontaminating sewage containing cyanide Process for decontaminating sewage containing cyanide and possibly also containing hydrogen sulfide which comprises where necessary adjusting the pH of the sewage to be decontaminated to a value of over 7.0 and bringing the sewage into intimate contact wi... | 05/25/1976 |
| 3931003 | Ion exchanger for the treatment of waste water An ion-exchanger material consisting of a cellulose ion-exchanger impregnated with .gamma.-manganese dioxide. A method for the treatment of waste water to remove dissolved high molecular organic compounds, ammonium and phosphate ions therefrom, comprising... | 01/06/1976 |
