Granted Patent
Utility
US 5,635,211 · App. 08/391,990
Microcapsules having walls made of polyisocyanate/guanidine reaction products
Inventors:
Ulrich Nehen, Jurgen Weisser
Patented Case
View Patent ↗
Granted: Jun 3, 1997
Filed: Feb 21, 1995
Inventors
Ulrich Nehen
Jurgen Weisser
Assignee (at issue)
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.