Granted Patent
Utility
US 5,334,489 · App. 07/965,162
Process for generation of squaric acid and for imaging, and imaging medium for use therein
Inventors:
Jurgen M. Grasshoff, Mark R. Mischke, Stephen J. Telfer
Patented Case
View Patent ↗
Granted: Aug 2, 1994
Filed: Oct 23, 1992
Inventors
Jurgen M. Grasshoff
Mark R. Mischke
Stephen J. Telfer
Assignee (at issue)
Polaroid Corporation
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.