Granted Patent
Utility
US 5,753,155 · App. 08/646,598
Gating for production of rigid polyurethane foam
Inventor:
Lotar Hanusa
Patented Case
View Patent ↗
Granted: May 19, 1998
Filed: May 8, 1996
Inventor
Lotar Hanusa
Assignee (at issue)
Bayer Aktiengesellschaft
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.