Granted Patent
Utility
US 4,622,975 · App. 06/424,387
Ear canal electrode
Inventors:
Hal C. Danby, Myron A. Beigler
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Sep 27, 1982
Inventors
Hal C. Danby
Myron A. Beigler
Assignee (at issue)
Minnesota Mining and Manufacturing Company
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.