Granted Patent
Utility
US 4,301,321 · App. 06/177,306
Two-axis focusing energy concentrator
Inventor:
Frederick T. C. Bartels
Patented Case
View Patent ↗
Granted: Nov 17, 1981
Filed: Aug 11, 1980
Inventor
Frederick T. C. Bartels
Assignee (at issue)
Spectrolab, 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.