Granted Patent
Utility
US 4,385,430 · App. 06/274,939
Method of forming an energy concentrator
Inventor:
Frederick T. C. Bartels
Patented Case
View Patent ↗
Granted: May 31, 1983
Filed: Jun 18, 1981
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.