Patents by Inventor Augustus Fletcher
Augustus Fletcher has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5130168Abstract: An electroless gold plating composition comprises an aqueous solution of alkali metal gold cyanide, alkali metal cyanide, alkali metal hydroxide, a reducer selected from borohydrides and alkyl amine boranes, and a stabilizer having the formula ##STR1## wherein R.sub.1 is --COOH, --OH, --CH.sub.2 OH, or --SO.sub.3 H (or an alkali metal salt thereof), R.sub.2 is --COOH, --OH, --Cl, --H, (or an alkali metal salt thereof) and is disposed in the 2, 5, or 6 ring position, and --NO.sub.2 is in the 3 or 4 ring position. This composition has a pH of 12.5-14.0, is heated at 85.degree.-95.degree. C., and operates at an oxidation/reduction potential of -550 to -700 millivolts to produce high purity gold deposits of amorphous structure and good hardness for electronic applications. The composition may be replenished as many as ten turnovers.Type: GrantFiled: May 15, 1989Date of Patent: July 14, 1992Assignee: Technic, Inc.Inventors: Zoltan F. Mathe, Augustus Fletcher, deceased
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Patent number: 4778574Abstract: A bath for electroplating palladium employs a combination of an aliphatic amine compound and an alicyclic amine compound as metal ion complexing agents.Type: GrantFiled: September 14, 1987Date of Patent: October 18, 1988Assignee: American Chemical & Refining Company, Inc.Inventors: Zoltan F. Mathe, Augustus Fletcher
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Patent number: 4548791Abstract: A solution for simultaneously stripping gold and palladium-containing deposits from substrates carrying them is provided, which is capable of efficient operation under practical and desirable conditions, particularly for recovering the precious metal electroplate and flash coatings from electronic components. The solution contains a thallium compound, in addition to a nitrobenzoate derivative, a soluble cyanide, and certain optional ingredients.Type: GrantFiled: September 30, 1983Date of Patent: October 22, 1985Assignee: American Chemical & Refining Company, Inc.Inventors: Augustus Fletcher, William L. Moriarty
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Patent number: 4465564Abstract: A bath for electrodepositing gold utilizes, as the essential ingredients of its electrolyte, salts providing the tartrate radical and the carbonate radical. The bath will have a pH value ranging from approximately neutral to highly alkaline, and adjustments to lower the pH will most advantageously be made utilizing tartaric acid. The bath operates with relatively low gold concentrations, and is capable of producing highly pure deposits and highly desirable alloy deposits; it is especially well suited for semi-conductor industry applications.Type: GrantFiled: June 27, 1983Date of Patent: August 14, 1984Assignee: American Chemical & Refining Company, Inc.Inventors: Augustus Fletcher, David N. Cockayne, William L. Moriarty
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Patent number: 4396471Abstract: An all-purpose gold cyanide electroplating bath utilizes a cobalt, nickel, or indium hardener as a chelate with the acid form of a methyl vinyl ether/maleic anhydride interpolymer. The bath is capable of producing high levels of hardness in deposits that are substantially pure gold; it is efficient, very stable, resistent to contamination, and it is well-suited for utility at a wide range of current densities.Type: GrantFiled: December 14, 1981Date of Patent: August 2, 1983Assignee: American Chemical & Refining Company, Inc.Inventors: Augustus Fletcher, William L. Moriarty
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Patent number: 4297177Abstract: A novel bath is provided for producing bright and relatively stress free electrodeposits of palladium/nickel alloy upon a workpiece. The bath includes, in addition to palladium and nickel ions as ammino complexes, amounts of saccharin and 3-butyne-2-ol that are, respectively, effective to reduce internal stresses and to brighten the deposit.Type: GrantFiled: September 19, 1980Date of Patent: October 27, 1981Assignee: American Chemical & Refining Company IncorporatedInventors: Augustus Fletcher, William L. Moriarty
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Patent number: 4253920Abstract: A bath for electroplating hard gold deposits at relatively high current efficiencies comprises an aqueous solution of a phosphate electrolyte, 1-hydroxyethylidene-1,1-diphosphonic acid, metal constituent, alkali metal gold cyanide and a small amount of free alkali metal cyanide. The bath is maintained at a pH of 3.0-13.0 and operated at a current density of 0.1-165 amperes per square decimeter.Type: GrantFiled: March 20, 1980Date of Patent: March 3, 1981Assignee: American Chemical & Refining Company, IncorporatedInventors: Augustus Fletcher, William L. Moriarty
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Patent number: 4197172Abstract: A bath for electroplating hard gold deposits at relatively high current efficiencies comprises an aqueous solution of an alkali metal dihydrogen phosphate, nitrilotris(methylene) triphosphonic acid, a nickel and/or cobalt phosphate compound, triethanolamine borate, alkali metal gold cyanide and a small amount of free alkali metal cyanide. The bath is maintained at a pH of 3.8-4.5 and operated at a current density of 0.1-20 amperes per square decimeter.Type: GrantFiled: April 5, 1979Date of Patent: April 8, 1980Assignee: American Chemical & Refining Company IncorporatedInventors: Augustus Fletcher, William L. Moriarty
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Patent number: 4168214Abstract: An aqueous bath for the electroplating of gold is particularly adapted for plating a gold strike on stainless steel and includes about 2 to 16.5 grams per liter of auric(III) gold in a cyanide complex. Potassium nitrate is employed as an electrolyte and ethylenediamine hydrochloride is added as a complexer. Nickel, cobalt, copper, tin, or indium ions may be present as an alloying ingredient for the gold and pH of the bath is not more than 4.0, preferably not more than 1.5. In the method of preparing the bath, an aqueous solution of potassium gold chloride KAu(Cl).sub.4 and potassium nitrate is prepared. Potassium cyanide is added to the solution and reacts with the potassium gold chloride to form a gold cyanide complex. Ethylenediamine hydrochloride is then added to the solution. The ethylenediamine hydrochloride may include nickel chloride or other salts to provide the alloying metal additives for the gold and hydrochloric acid may be added to adjust the pH.Type: GrantFiled: June 14, 1978Date of Patent: September 18, 1979Assignee: American Chemical and Refining Company, Inc.Inventors: Augustus Fletcher, William L. Moriarty
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Patent number: 4155817Abstract: A bath for electroplating substantially pure silver deposits includes 2-240 grams per liter of alkali metal silver cyanide, a water-soluble electrolyte and a water-soluble selenium compound containing selenium in the -2 oxidation state. The bath has a pH of 8-10 and a free cyanide content of less than 1.5 grams per liter. The bath is maintained at a temperature of 18.degree.-24.degree. Centigrade and may be operated to provide current densities of 0.1-75 amperes per square decimeter.Type: GrantFiled: August 11, 1978Date of Patent: May 22, 1979Assignee: American Chemical and Refining Company, Inc.Inventors: Augustus Fletcher, William L. Moriarty
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Patent number: 4121982Abstract: An aqueous bath for electroplating a gold/silver alloy includes a water soluble electrolyte such as potassium pyrophosphate, gold and silver present as their respective alkali metal cyanides, and a water soluble brightener system. The water soluble brightener system comprises a selenium compound containing selenium in the -2 valance state and a polyethyleneimine compound. The bath has a pH of about 8 to 10 and may include tetraethanolamine borate ester to decrease the tensile stress of the electrodeposit.Type: GrantFiled: February 3, 1978Date of Patent: October 24, 1978Assignee: American Chemical & Refining Company IncorporatedInventors: William L. Moriarty, Augustus Fletcher