Abstract: A forward osmosis method for desalination includes recyclable driving solutes which are easy to remove and recycle, have a high rejection by forward osmosis membranes, have low toxicity and are cost efficient.

Abstract: A halogen resistant polyamide is formed from the reaction product of an amine monomer and an acid chloride monomer wherein the amino group of the starting amine monomer is separated from the aromatic amine ring system by an alkyl group and (i) minimizes halogenation on the amine and (ii) minimizes N-halogenation at a pH range of approximately 7 to approximately 10.5. A membrane is made from the polyamide for use, for example, in a reverse osmosis desalination unit.

Abstract: A chlorine resistant polyamide is formed from the reaction product of an amine and an acid chloride monomer wherein both the amine and the acid chloride monomer are modified with electron-withdrawing groups that exhibit sufficient activity to (i) minimize any chlorination on both the amine and acid chloride and (ii) minimize N-chlorination. A membrane is made from the polyamide for use, for example, in a desalination unit.

Abstract: A forward osmosis method for desalination includes recyclable driving solutes which are easy to remove and recycle, have a high rejection by forward osmosis membranes, have low toxicity and are cost efficient.

Abstract: A method for immediately placing a non-occlusive and non-functional temporary dental implant prosthesis in the jawbone of a human patient with the prosthesis having a size and shape of a natural human tooth.

Abstract: A method for immediately placing a non-occlusive and non-functional temporary dental implant prosthesis in the jawbone of a human patient with the prosthesis having a size and shape of a natural human tooth.

Abstract: A near net tooth shaped ceramic prosthesis is provided in a tooth shape to minimize the amount of cutting and baking required to finish the outer crown portion of the dental prosthesis. A metallic core is provided for attachment to an implant in a patient's mouth. A ceramic crown is then attached to the core.

Abstract: A dental abutment having a metallic core, a shield surrounding an outer surface of the core, and a polymeric cuff surrounding the core and shield, wherein the cuff bonds to a polymeric prosthesis.

Abstract: A near net tooth shaped ceramic prosthesis is provided in a tooth shape to minimize the amount of cutting and baking required to finish the outer crown portion of the dental prosthesis. A metallic core is provided for attachment to an implant in a patient's mouth. A ceramic crown is then attached to the core.

Abstract: A method for immediately placing a non-occlusive and non-functional temporary dental implant prosthesis in the jawbone of a human patient with the prosthesis having a size and shape of a natural human tooth.

Abstract: A dental abutment having a metallic core, a shield surrounding an outer surface of the core, and a polymeric cuff surrounding the core and shield, wherein the cuff bonds to a polymeric prosthesis.

Abstract: A method for immediately placing a non-occlusive and non-functional temporary dental implant prosthesis in the jawbone of a human patient.

Abstract: A dental positioning guide has two pins connected to a hub section. The pins may be rotated to a plurality of angular positions.

Abstract: A reverse osmosis module in which the semipermeable membrane comprising a microporous support reinforced on one side thereof with a backing material and the other side thereof having deposited thereon an ultra-thin film formed by cross-linking polyethyleneimine with a cross-linking agent such as isophthaloyl chloride and the backing for the membrane sandwich comprising a film of a polyethylene-terephthalate positioned between two layers of an epoxy-impregnated polyester may be utilized to concentrate or dewater aqueous solutions at elevated temperatures and pressures. The module may be used at temperatures ranging from about 50.degree. to about 95.degree. C. and pressures ranging from 400 to about 1200 psi to dewater aqueous sugar solutions, salt solutions, starch solutions, etc.

Abstract: Membranes, which may be used for the separation of gases, comprise a thin film of a semi-permeable material composited on a porous support member. The membranes are prepared by passing a support member through a solution of a halogenated hydrocarbon solvent containing a semi-permeable membrane forming prepolymer and cross-linking agent. This step is then followed by the cross-linking of the prepolymer by treatment at an elevated temperature. The process may be exemplified by passing one finely porous surface of a cellulose nitrate-cellulose acetate support member through a solution of dimethyl silicone in a halogenated solvent such as trifluorotrichloroethane followed by treatment at a temperature in the range of from about 50.degree. to about 150.degree. C. to form the desired membrane.

Abstract: This invention is a device which enables one to layout sheet metal elbows of many sizes, degree of angle, segments, and throat radiuses.Further this invention is a device for laying out round pipe sections to intersect another round pipe at a right angle either on or off center of the pipe being intersected to form a sheet metal T joint of many sizes and combination of sizes.Another advantage is the use of the transparent, rectangular, plastic elements, when one element is affixed upon the profile of an object to be intersected the lines required in this method of layout can be readily ascertained, thus eliminating the drafting of same.The gist of this invention is a layout device, and method which enables one to layout hundreds of sheet metal objects in much less time and without the preliminary procedures which are often used in this type of sheet metal fabrication.