Granted Patent
Utility
US 4,699,667 · App. 06/551,753
Removing residual PCB S from transformers
Inventor:
Edward J. Walsh
Patented Case
View Patent ↗
Granted: Oct 13, 1987
Filed: Nov 14, 1983
Inventor
Edward J. Walsh
Assignee (at issue)
Westinghouse Electric Company LLC
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.