Granted Patent
Utility
US 3,944,629 · App. 05/482,532
Polyester initiated anionic catalyzed polymerization of lactam
Inventors:
Ross M. Hedrick, James D. Gabbert
Patented Case
View Patent ↗
Granted: Mar 16, 1976
Filed: Jun 24, 1974
Inventors
Ross M. Hedrick
James D. Gabbert
Assignee (at issue)
Monsanto 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.