Granted Patent
Utility
US 5,587,435 · App. 08/426,769
Polyethersulfone/polyester block copolymers and a process for their preparation
Inventors:
Aaron D. Meltzer, Alexander Karbach
Patented Case
View Patent ↗
Granted: Dec 24, 1996
Filed: Apr 21, 1995
Inventors
Aaron D. Meltzer
Alexander Karbach
Assignees (at issue)
Bayer Aktiengesellschaft
Bayer Aktiengesellschaft
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.