Granted Patent
Utility
US 4,701,949 · App. 06/764,225
Frequency responsive party telephone line selection apparatus and method
Inventors:
Daniel Lynch, Steven B. Perry
Patented Case
View Patent ↗
Granted: Oct 20, 1987
Filed: Aug 9, 1985
Inventors
Daniel Lynch
Steven B. Perry
Assignee (at issue)
Keptel, 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.