Granted Patent
Utility
US 4,902,964 · App. 07/099,078
Program clock for an electronic demand register with automatic calibration based on sensed line frequency
Inventors:
William A. Szabela, Gordon R. Burns
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Sep 21, 1987
Inventors
William A. Szabela
Gordon R. Burns
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.