Granted Patent
Utility
US 5,868,438 · App. 08/025,555
Self-restrained adapter system for connecting plastic pipe system to metallic pipe system
Inventor:
Harvey E. Svetlik
Patented Case
View Patent ↗
Granted: Feb 9, 1999
Filed: Feb 18, 1998
Inventor
Harvey E. Svetlik
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.