Granted Patent
Utility
US 4,497,793 · App. 06/470,014
Microencapsulated naturally occuring pyrethrins
Inventor:
Joseph Simkin
Patented Case
View Patent ↗
Granted: Feb 5, 1985
Filed: Feb 25, 1983
Inventor
Joseph Simkin
Assignee (at issue)
Pennwalt 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.