Granted Patent
Utility
US 4,226,948 · App. 06/001,626
2-Trichloromethyloxazolidine and thiazolidine derivatives useful as flame retardants for polyurethane foam
Inventors:
Ivan Christoff Popoff, Stanley R. Sandler
Patented Case
View Patent ↗
Granted: Oct 7, 1980
Filed: Jan 8, 1979
Inventors
Ivan Christoff Popoff
Stanley R. Sandler
Assignee (at issue)
Pennwalt Corporation
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.