Granted Patent
Utility
US 4,401,771 · App. 06/399,517
Method for preparing polyester foam using cobalt/potassium promotors
Inventor:
James Ahnemiller
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Jul 19, 1982
Inventor
James Ahnemiller
Assignee (at issue)
Uniroyal Ltd.
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.