Granted Patent
Utility
US 4,196,320 · App. 05/866,696
Method and means for powering telephone span lines
Inventor:
Todd V. Townsend
Patented Case
View Patent ↗
Granted: Apr 1, 1980
Filed: Jan 3, 1978
Inventor
Todd V. Townsend
Assignee (at issue)
Lynch Communications Systems, 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.