Granted Patent
Utility
US 5,990,051 · App. 09/055,549
Injection molded degradable casing perforation ball sealers
Inventors:
Noel D. Ischy, Craig Steven Fox
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Apr 6, 1998
Inventors
Noel D. Ischy
Craig Steven Fox
Assignee (at issue)
Fairmount Minerals, Ltd.
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.