Granted Patent
Utility
US 4,812,850 · App. 07/030,749
Method and apparatus for combining waveforms
Inventors:
David J. Gunton, Lucy J. Manning
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Mar 27, 1987
Inventors
David J. Gunton
Lucy J. Manning
Assignee (at issue)
BRITISH GAS PLC
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.