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| Number | Title | Issue Date |
| 4188354 | Method for the preparation of asymmetrical membranes Asymmetric membranes for osmosis and ultrafiltration are prepared from fluorinated polymers which are dissolved in one or more solvents, cast on a plate, allowed to evaporate and precipitated with a nonsolvent. The polymeric material can variously be modi... | 02/12/1980 |
| 4188291 | Treatment of industrial waste water A method is disclosed for processing industrial waste waters and, in particular, blow down water from thermal electric plants. The water is processed to concentrate the salts contained therein and to obtain a concentrated brine which can then be passed to... | 02/12/1980 |
| 4187173 | Reverse osmosis method and apparatus Reverse osmosis, particularly for water desalination, is achieved using semipermeable membranes which selectively permeate purified water from a feed solution pressurized by reciprocating piston or diaphragm pump. Pump action is assisted by returning pres... | 02/05/1980 |
| 4186084 | Hydrophilic fluoropolymers Certain fluoropolymers, when chemically modified by reacting them with sulfur or phosphorus containing compounds, become hydrophilic materials useful for making ion-exchange membranes, especially diaphragms for electrolytic cells, particularly chlor-alkal... | 01/29/1980 |
| 4176057 | Method and apparatus for recovering liquid and solid constituents of water solutions containing sparingly soluble solids Water, such as the effluent from cooling towers, boilers, waste streams of industrial plants, hydrometallurgical processes or other sources of water solutions containing sparingly soluble solids is efficiently separated into its aqueous and solid constitu... | 11/27/1979 |
| 4169789 | Process and apparatus for purifying sea water by reverse osmosis Sea water is purified by reverse osmosis in an offshore installation wherein sea water is withdrawn from the sea by a low pressure pump and passed through plural-stage physical filters having decreasing degrees of porosity to remove suspended particles an... | 10/02/1979 |
| 4167480 | Process for de-salting of water and apparatus for performing this process Process for desalting of water by hyperfiltration (reverse osmosis), characterized in conveying the water to be desalted through at least one magnetic field and keeping the water streaming within the magnetic field and by removing via a throttle area a pa... | 09/11/1979 |
| 4165288 | Process of treating waste water from a textile vat dyeing operation to produce a concentrate for reuse Process of treating waste water from a textile vat dyeing operation containing water, vat dyes, and dissolved and undissolved impurities including salts, lint, foreign matter, etc. to produce a concentrate suitable for direct reuse in the vat dyeing opera... | 08/21/1979 |
| 4161445 | Process for the desalination of salt containing water Water which contains contaminants such as brine may be subjected to a desalination process and made potable thereby by treating the water in a reverse osmosis and ion exchange system, the heat which is present in the water source being utilized to thermal... | 07/17/1979 |
| 4160727 | Method and apparatus utilizing staged reverse osmosis units for purifying and dispensing water Method and apparatus utilizing successive reverse osmosis stages to produce highly purified water from potable water in a manner particularly suitable for use in a coin operated vending machine. The flow rates in the reverse osmosis stages are matched so ... | 07/10/1979 |
| 4157267 | Continuous separation of fructose from a mixture of sugars A process for continuously separating, in liquid phase, fructose from a liquid feed mixture of sugars containing essentially fructose and glucose by contact with a solid sorbent of zeolite. The process utilizes a simulated countercurrent flow system where... | 06/05/1979 |
| 4156645 | Conversion of sea water by reverse osmosis A process for recovery of fresh water by reverse osmosis from high salt content feed, such as sea water, comprises treating the feed water in an initial stage at relatively low pressure (between about 300 and 550 psi) employing a loose semipermeable membr... | 05/29/1979 |
| 4156621 | Regeneration of used dishwashing water without chemical additives for sanitizing and spot-free rinse uses An improved dishwashing system includes operating methods and apparatus for water and energy conservation and elimination of spot-reducing chemicals in the rinse water. Return water from the rinse cycle is stored in insulated tanks and rinse water flowing... | 05/29/1979 |
| 4141825 | Desalination process system and by-product recovery A desalination process system combining electro-dialysis, reverse osmosis and brine concentration with by-product recovery.... | 02/27/1979 |
| 4125463 | Reverse osmosis desalination apparatus and method Reverse osmosis desalination apparatus may comprise: a casing member placed in a well hole drilled therefor and having near the surface thereof an inlet through which salt water may be introduced from a salt water source; a conductor member centrally disp... | 11/14/1978 |
| 4083781 | Desalination process system and by-product recovery A desalination process system combining reverse osmosis, evaporation and brine concentration with by-product recovery.... | 04/11/1978 |
| 4083780 | Fluid purification system A fluid purification system is disclosed comprising a pressure vessel containing a plurality of spiral wrap membrane elements. The spiral wrap membrane elements are placed in parallel within the pressure vessel to purify an efficient amount of fluid for a... | 04/11/1978 |
| 4083732 | Sugar juice treatment Method of treating fresh sugar juice at about room temperature which includes removing non-sugar impurities, concentrating the resulting cold, water white juice by reverse osmosis to form a syrup which is evaporated to form direct white sugar and edible m... | 04/11/1978 |
| 4070280 | Manually operable reverse osmosis apparatus A reverse osmosis apparatus includes a pump for pressurizing feed water introduced into a pressure resistant container in which is slidably mounted a semipermeable membrane cartridge. A rod, attached to an end of the semipermeable membrane cartridge, pass... | 01/24/1978 |
| 4046686 | Reverse osmosis treatment of battery waste Reverse osmosis is made usable for removal of heavy metals from acid battery waste by a process in which dissolved calcium sulphate, produced by neutralization with lime, is sequestered by sodium hexametaphosphate before introduction into the permeator. T... | 09/06/1977 |
| 4046685 | Simultaneous production of multiple grades of purified water by reverse osmosis A reverse osmosis apparatus comprises an elongated pressure container housing a plurality of semipermeable membrane cartridges in end-to-end relationship. A separate tap from the product water collector of the semipermeable membrane cartridge or cartridge... | 09/06/1977 |
| 4036749 | Purification of saline water There is disclosed a treatment of water that greatly reduces the scaling tendency of the water during its subsequent use or processing. The treatment comprises precipitation and separation of the calcium values of the water as calcium carbonate by the add... | 07/19/1977 |
| 4000065 | Method and apparatus for purifying aqueous streams contaminated with organic materials Aqueous streams contaminated with minor amounts of organic materials are separated into an aqueous fraction which is concentrated with respect to the organic contaminants and a water fraction relatively free of the organic contaminants by a method which i... | 12/28/1976 |
| 3992301 | Automatic flushing system for membrane separation machines such as reverse osmosis machines An automatic flushing and cleaning system for membrane separation machines such as reverse osmosis machines having plural modules or membranes. Cleaning may be by way of reducing the pressure to allow the membrane to relax, by the injection of air or iner... | 11/16/1976 |
| 3978344 | Osmosis process for producing energy A process for generating energy by utilizing the osmotic pressure resulting when two liquids having different chemical potentials are each placed in contact with opposite sides of the same semipermeable membrane. The process is particularly applicable to ... | 08/31/1976 |
