Granted Patent
Utility
US 6,235,806 · App. 09/337,686
Open-celled rigid polyurethane foam and method for producing the same
Inventors:
Michihiro Ohga, Masato Hayashi, Junnichi Hosaka, Reishi Naka
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Jun 22, 1999
Inventors
Michihiro Ohga
Masato Hayashi
Junnichi Hosaka
Reishi Naka
Assignee (at issue)
Nisshinbo Industries, 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.