Granted Patent
Utility
US 4,313,347 · App. 06/137,729
Environmental testing system
Inventor:
Frederick H. Hull
Patented Case
View Patent ↗
Granted: Feb 2, 1982
Filed: Apr 7, 1980
Inventor
Frederick H. Hull
Assignee (at issue)
The Budd 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.