Granted Patent
Utility
US 6,500,447 · App. 09/373,698
pH-sensitive microcapsules
Inventors:
Robin W. Dexter, Brian Eric Benoff
Patented Case
View Patent ↗
Granted: Dec 31, 2002
Filed: Aug 13, 1999
Inventors
Robin W. Dexter
Brian Eric Benoff
Assignee (at issue)
BASF SE
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.