Granted Patent
Utility
US 4,299,481 · App. 06/026,121
Adjustable current lamphouse
Inventor:
Darwin E. Chapman
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Apr 2, 1979
Inventor
Darwin E. Chapman
Assignee (at issue)
Ciba-Geigy
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.