Patents Represented by Attorney Fred S. Valles
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Patent number: 4224282Abstract: A composite injector is provided for handling the introduction to a thick-walled, high pressure polymerization autoclave of both monomer and catalyst streams. Said injector comprises an inner, separately enclosed, high pressure catalyst conduit of relatively small cross-section terminating in a fine orifice at its downstream end which substantially coincides with the inner wall boundary of said autoclave, and, surrounding the upstream portion of said catalyst conduit at least, a pressure-tight outer housing of much larger inner cross-section having an upstream monomer supply connection and a downstream fitting for sealing engagement with a matched opening through said thick-walled autoclave. By introducing the catalyst and the monomer through their respective separate passageways of this composite injector, the resultant catalyst stream is released into the monomer stream just as said streams are both emerging into the open space beyond the inner wall boundary of said autoclave.Type: GrantFiled: November 8, 1976Date of Patent: September 23, 1980Assignee: El Paso Polyolefins CompanyInventors: Robert B. Steinert, William A. Schuessler
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Patent number: 4159261Abstract: This invention relates to the use of indium compounds as thermal stabilizers for vinyl halide resins. Very small additions of indium compounds to vinyl halide resins, with or without the inclusion of other stabilizers, have been found to contribute marked improvements in resistance to high temperature discoloration. For example, additions sufficient to provide less than 100 ppm of indium based upon the weight of said resin are particularly effective in helping to maintain original color over a longer period of time at elevated temperatures such as are encountered during hot processing and fabricating operations.Type: GrantFiled: January 26, 1977Date of Patent: June 26, 1979Assignee: Dart Industries Inc.Inventor: Dale J. Dieckmann
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Patent number: 4141850Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and certain primary diols.Type: GrantFiled: November 8, 1977Date of Patent: February 27, 1979Assignee: Dart Industries Inc.Inventors: Philip D. Readio, John L. H. Allan
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Patent number: 4140772Abstract: Aqueous hydrogen peroxide solutions used in metal dissolution processes are effectively stabilized against decomposition caused by metal ion contaminants by addition of saccharin or an alkali-metal salt of saccharin to the solutions.Type: GrantFiled: February 21, 1978Date of Patent: February 20, 1979Assignee: Dart Industries Inc.Inventor: Theodore F. Korenowski
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Patent number: 4140646Abstract: Clean etchings at high rates are obtained using a solution containing sulfuric acid, hydrogen peroxide, a catalytic amount of a selenium compound of a +4 oxidation state and t-butyl hydroperoxide.Type: GrantFiled: November 8, 1977Date of Patent: February 20, 1979Assignee: Dart Industries Inc.Inventors: Ronald A. Kent, John L. H. Allan, Philip D. Readio
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Patent number: 4139429Abstract: An electrolytic plating cell is provided, wherein by means of flow directional baffle arrangements a rapid, uniform parallel movement of the electrolyte past all electrode surfaces can be maintained, while minimizing energy losses in moving the electrolyte.Type: GrantFiled: June 15, 1978Date of Patent: February 13, 1979Assignee: Dart Industries Inc.Inventors: Frederick A. Steward, James H. Weet
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Patent number: 4130455Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and a catalytic amount of a thiosulfate of sodium or potassium.Type: GrantFiled: November 8, 1977Date of Patent: December 19, 1978Assignee: Dart Industries Inc.Inventors: Moenes L. Elias, Millard F. Good
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Patent number: 4118295Abstract: A method useful in the regeneration of a spent chromic acid-sulfuric acid plastic etch solution and also in the recovery of such etchant chemicals from rinse water associated with a plastic etching process, which method involves an electrolytic treatment, in which oxidation of trivalent chromium impurities to the serviceable hexavalent state takes place simultaneously with expulsion of organic impurities from the solution.Type: GrantFiled: April 20, 1976Date of Patent: October 3, 1978Assignee: Dart Industries Inc.Inventors: Theodore Frank Korenowski, Leslie Emery Lancy
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Patent number: 4095016Abstract: A catalyst system comprising (1) a cocrystallized titanium trichloride-aluminum chloride modified with phosphorus oxytrichloride, (2) an organo aluminum compound, and (3) an organic trithiophosphite or trithiophosphate for the production of polymers in high yields and of reduced amorphous polymer content.Type: GrantFiled: December 15, 1976Date of Patent: June 13, 1978Assignee: Dart Industries, Inc.Inventors: Frederick Elias Carrock, Peter James Perron, Edward August Zukowski
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Patent number: 4091200Abstract: In the production of ethylene-vinyl acetate copolymers in a free radical catalyst initiated high pressure process, explosive decomposition is prevented by contacting the reactor effluent downstream of the reactor outlet with small amounts of a hindered phenolic compound, separating unreacted monomer from the mixture of copolymer, unreacted monomer and scavenger in a separation zone and recycling the separated monomer to the reactor.Type: GrantFiled: March 23, 1977Date of Patent: May 23, 1978Assignee: Dart Industries Inc.Inventor: Jan Edmond Vandegaer
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Patent number: 4076043Abstract: A ball type check valve is provided featuring a simple rugged structure which can be easily fabricated and finished to have excellent fatigue strength and resistance to the stresses of continually repeating pressure fluctuations. The key to the success of this valve is the basic monobloc body used therein. Thus, one single compact body block is fashioned with a longitudinal opening extending therethrough, the median portion of which is a smooth cylindrical bore designed to house the ball stop, biasing spring and associated movable valve parts while the approach sections of the opening leading thereto from either end are of larger cross-section. The valve is then completed by incorporating upstream and downstream tail pieces enclosed within said approach sections and held in end to end direct contact sealing relationship with annular shoulder areas at either end of said median portion by means of suitable back-up attachment devices engaged with said body block.Type: GrantFiled: July 1, 1976Date of Patent: February 28, 1978Assignee: Dart Industries Inc.Inventor: John Rogan
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Patent number: 4075146Abstract: A polyolefin composition having excellent stability against degradation caused by exposure to heat and oxygen in the presence of copper, which composition is stabilized with a synergistic stabilizer system containing at least one phenolic antioxidant and calcium stearate.Type: GrantFiled: January 2, 1976Date of Patent: February 21, 1978Assignee: Dart Industries, Inc.Inventor: Kornel Dezso Kiss
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Patent number: 4073766Abstract: Novel coupling agents for use in filled polymers to improve physical properties e.g. melt flow and impact strength, which agents are organic borates containing at least one functional group reactive with the filler and at least one functional group compatible with the polymer.Type: GrantFiled: December 15, 1976Date of Patent: February 14, 1978Assignee: Dart Industries, Inc.Inventors: Marvin M. Fein, Birendra K. Patnaik, Frank K. Y. Chu
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Patent number: 4065635Abstract: The insulation of electrical cables which are utilized in environments likely to cause extraction of stabilizer systems is achieved through the use of compositions in which a disubstituted alkylhydroxyphenyl alkanoyl hydrazine is used as extraction resistant stabilizer for ethylene-propylene copolymer coating materials. Equivalent nomenclature for the preferred stabilizer is disubstituted di-t-butyl hydroxy hydro cinnamoyl (DTBHC) hydrazine. The DTBHC hydrazine is substantially the only stabilizer used in the stabilized compositions.Type: GrantFiled: December 16, 1975Date of Patent: December 27, 1977Assignee: Dart Industries, Inc.Inventor: Kornel D. Kiss
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Patent number: 4061694Abstract: Polypropylene molding compositions of improved impact strength are obtained by subjecting certain block copolymers of ethylene and propylene to controlled oxidative degradation.Type: GrantFiled: December 21, 1976Date of Patent: December 6, 1977Assignee: Dart Industries Inc.Inventor: Eugene Gennaro Castagna
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Patent number: 4059652Abstract: An extraction resistant, smoke resistant linear polymeric phenolic antioxidant containing sulfonic acid groups or salts thereof in at least a portion of the recurring phenolic ring groups.Type: GrantFiled: April 15, 1976Date of Patent: November 22, 1977Assignee: Dart Industries Inc.Inventors: John Leslie Hugh Allan, John James Roderick
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Patent number: 4049751Abstract: A hindered phenolic antioxidant stablizer for polyolefins is rendered extraction resistant by complexing it with an agent containing complexing groups derived from N-vinyl-2-pyrrolidone or a N-dialkyl substituted amino alkyl ester of an .alpha.,.beta.-unsaturated carboxylic acid.Type: GrantFiled: April 26, 1976Date of Patent: September 20, 1977Assignee: Dart Industries Inc.Inventors: Frank Scardiglia, Kornel Dezso Kiss
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Patent number: 4045339Abstract: A two-step process for the waste treatment of fluoroborate solutions which involves hydrolysis at an acidic pH in the presence of calcium ions toliberate fluoride and subsequent removal of fluoride values, e.g. by precipitation as calcium fluoride under alkaline conditions.Type: GrantFiled: October 18, 1976Date of Patent: August 30, 1977Assignee: Dart Industries Inc.Inventors: Theodore Frank Korenowski, Jerry Lee Penland, Chalmer John Ritzert
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Patent number: 4045171Abstract: A process is disclosed for the removal of colorants from industrial dye waste solutions which involves the treatment of the waste with a solution of a Group IA or IIA metal halide or sulfate to precipitate the colorant, which subsequently is removed by common solid separation techniques as a dense material of relatively high solids content. The process is particularly suitable for integration into a dyeing process to increase color fastness of the dyed article.Type: GrantFiled: March 28, 1975Date of Patent: August 30, 1977Assignee: Dart Industries Inc.Inventor: Leslie Emery Lancy
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Patent number: 4041758Abstract: A fluid flow meter of the variable area flow passage type is provided wherein the variation in said flow passage area is effected by the vertical displacement of a control boundary which is supported by a substantially horizontal annular diaphragm element. Said control boundary is shaped and sized so that the overall displacement required for the flow rate range desired is within the stroke capacity delivered by the total, up and down, free flexing action of said diaphragm element, thereby achieving substantially constant differential pressure operation at a very reasonable value which is due almost entirely to gravity. The resulting unit is very compact and stable and is characterized by very smooth linear response between vertical displacement and fluid flow rate. Said vertical displacement can be measured by various means but is preferably transduced to an equally linear, smooth and steady electrical signal by a direct connection with a specially adapted differential transformer.Type: GrantFiled: December 24, 1975Date of Patent: August 16, 1977Assignee: Dart Industries, Inc.Inventor: Nyyrikki K. Stenberg