Granted Patent
Utility
US 5,137,777 · App. 07/625,534
Fire-retardant polymer foam composites
Inventors:
Lance D. Silverman, Warren F. Legg, Wilfred E. Willis
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Dec 11, 1990
Inventors
Lance D. Silverman
Warren F. Legg
Wilfred E. Willis
Assignee (at issue)
Ametek, 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.