Granted Patent
Utility
US 4,351,758 · App. 06/175,564
Polyester blends
Inventors:
Shau-Zou Lu, Melvin L. Druin
Patented Case
View Patent ↗
Granted: Sep 28, 1982
Filed: Aug 6, 1980
Inventors
Shau-Zou Lu
Melvin L. Druin
Assignee (at issue)
Celanese GmbH
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.