Granted Patent
Utility
US 4,819,722 · App. 07/145,310
Metal well screen assembly with plastic end fitting and method of attaching same
Inventor:
Raymond Daly
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Jan 19, 1988
Inventor
Raymond Daly
Assignee (at issue)
Johnson Filtration Systems
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.