Granted Patent
Utility
US 5,284,928 · App. 07/956,518
Modified polyureas containing N-cyanaminocarbonyl urea groups and a process for their preparation
Patented Case
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Granted: Feb 8, 1994
Filed: Oct 5, 1992
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.