Granted Patent
Utility
US 4,157,147 · App. 05/782,689
Container
Inventors:
Laurence R. DeForest, Frank P. Richards
Patented Case
View Patent ↗
Granted: Jun 5, 1979
Filed: Mar 30, 1977
Inventors
Laurence R. DeForest
Frank P. Richards
Assignee (at issue)
Phillips Petroleum 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.