Granted Patent
Utility
US 4,660,863 · App. 06/758,370
Casing patch seal
Inventors:
Thomas F. Bailey, Nehal Shah
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Jul 24, 1985
Inventors
Thomas F. Bailey
Nehal Shah
Assignee (at issue)
A-Z International Tool 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.