Granted Patent
Utility
US 4,978,422 · App. 07/496,337
Method for improving insulation resistance of printed circuits
Inventors:
Raymond A. Letize, David Dean Sullivan, William R. Thomas, Thomas Murry
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: Mar 20, 1990
Inventors
Raymond A. Letize
David Dean Sullivan
William R. Thomas
Thomas Murry
Assignee (at issue)
MacDermid, Incorporated
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.