Granted Patent
Utility
US 6,422,575 · App. 09/524,298
Expandable pre-formed plug
Inventors:
Michael Czaplicki, David D. Apfel
Patented Case
View Patent ↗
Granted: Jul 23, 2002
Filed: Mar 14, 2000
Inventors
Michael Czaplicki
David D. Apfel
Assignee (at issue)
L&L Products, Inc.
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.