Granted Patent
Utility
US 4,540,857 · App. 06/520,194
Circuit testing of telephone grids or the like
Inventors:
Donald Parsons, Gerald J. Parsons, Brian D. Greenwald, Elizabeth A. Parsons
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Aug 4, 1983
Inventors
Donald Parsons
Gerald J. Parsons
Brian D. Greenwald
Elizabeth A. Parsons
Assignee (at issue)
Communications Test Design, Inc.
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.