Granted Patent
Utility
US 4,550,157 · App. 06/608,004
Polyamide block copolymer from lactam and azetidine-2,4-dione
Inventors:
Shenghong A. Dai, Steven J. Grossman, Kemal Onder
Patented Case
View Patent ↗
Granted: Oct 29, 1985
Filed: May 7, 1984
Inventors
Shenghong A. Dai
Steven J. Grossman
Kemal Onder
Assignee (at issue)
THE DOW CHEMICAL COMPANY
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.