Granted Patent
Utility
US 4,795,415 · App. 06/946,938
Greenhouse plastic film installation
Inventor:
Michael A. Francis
Patented Case
View Patent ↗
Granted: Jan 3, 1989
Filed: Dec 29, 1986
Inventor
Michael A. Francis
Assignee (at issue)
Ethyl Corporation
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.