Patents by Inventor Augustus Fletcher, deceased

Augustus Fletcher, deceased 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).

  • Electroless gold plating bath and method of using same
    Patent number: 5130168
    Abstract: 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: Grant
    Filed: May 15, 1989
    Date of Patent: July 14, 1992
    Assignee: Technic, Inc.
    Inventors: Zoltan F. Mathe, Augustus Fletcher, deceased