Granted Patent
Utility
US 5,176,002 · App. 07/683,252
Method of controlling vapor loss from containers of volatile chemicals
Inventors:
John V. O'Brien, Robert A. Wojnarowski
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Apr 10, 1991
Inventors
John V. O'Brien
Robert A. Wojnarowski
Assignee (at issue)
Process Systems International, Inc.
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.