Patents by Inventor David S. Maternaghan

David S. Maternaghan 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).

  • Etching compositions
    Patent number: 5496485
    Abstract: An aqueous composition for etching and cleaning semiconductor devices comprises a solution of an acid and a surfactant which is a branched chain aliphatic amine having the formula C.sub.m H.sub.2m+3 N, where m is an integer from 7 to 10. The compositions are stable for long periods of time and do not suffer foaming problems when used in recirculation filtration systems.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: March 5, 1996
    Assignee: Micro-Image Technology Limited
    Inventor: David S. Maternaghan