Granted Patent
Utility
US 5,171,611 · App. 07/399,452
Method of surface treatment surface treatment of void containing substrate
Inventors:
Christopher S. Porter, John Powell
Patented Case
View Patent ↗
Granted: Dec 15, 1992
Filed: Oct 23, 1989
Inventors
Christopher S. Porter
John Powell
Assignee (at issue)
Ravensworth Limited
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.