Granted Patent
Utility
US 4,887,028 · App. 07/099,257
Watthour meter with isolation transformers having a feedback loop
Inventors:
John T. Voisine, Andy Joder
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Sep 21, 1987
Inventors
John T. Voisine
Andy Joder
Assignee (at issue)
Landis & Gyr Metering, 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.