Granted Patent
Utility
US 4,509,211 · App. 06/494,807
Infrared extension system
Inventor:
Michael S. Robbins
Patented Case
View Patent ↗
Granted: Apr 2, 1985
Filed: May 16, 1983
Inventor
Michael S. Robbins
Assignee (at issue)
Xantech 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.