Granted Patent
Utility
US 4,373,391 · App. 06/257,081
Relative humidity sensitive material
Inventor:
Peter D. Johnson
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Apr 24, 1981
Inventor
Peter D. Johnson
Assignee (at issue)
General Electric 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.