Granted Patent
Utility
US 4,670,870 · App. 06/725,539
Adaptive cancellation bridge circuit
Inventors:
John Hewinson, John A. D. Stockdale
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Apr 22, 1985
Inventors
John Hewinson
John A. D. Stockdale
Assignee (at issue)
Plessey Overseas Limited
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.