Granted Patent
Utility
US 5,449,557 · App. 07/579,268
Compatible polymer mixtures
Inventors:
Ralf Liebler, Werner Ringenberg
Patented Case
View Patent ↗
Granted: Sep 12, 1995
Filed: Sep 5, 1990
Inventors
Ralf Liebler
Werner Ringenberg
Assignee (at issue)
ROHM CO., 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.