Granted Patent
Utility
US 4,504,991 · App. 06/386,101
Fire-resistant mattress and high strength fire-retardant composite
Inventor:
Alvin R. Klancnik
Patented Case
View Patent ↗
Granted: Mar 19, 1985
Filed: Jun 7, 1982
Inventor
Alvin R. Klancnik
Assignee (at issue)
Sealy, 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.