Granted Patent
Utility
US 4,686,393 · App. 06/696,493
Circuit breakers for direct and alternating current
Inventors:
Peter M. McEwan, Iorwerth Thomas
Patented Case
View Patent ↗
Granted: Aug 11, 1987
Filed: Jan 30, 1985
Inventors
Peter M. McEwan
Iorwerth Thomas
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT CORPORATION
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.