Granted Patent
Utility
US 4,439,638 · App. 06/343,445
Sound-activated code-controlled detection system for telephones and the like
Inventors:
Scott Seligsohn, Duane R. Bolgiano, Sherwin Seligsohn
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Jan 28, 1982
Inventors
Scott Seligsohn
Duane R. Bolgiano
Sherwin Seligsohn
Assignee (at issue)
International Mobile Machines Corporation
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.