Granted Patent
Utility
US 5,811,220 · App. 08/729,291
On-press lithographic development methodology facilitated by the use of a disperse hydrophilic microgel
Inventors:
Chieh-Min Cheng, Rong-Chang Liang, Yi-Hua Tsao
Patented Case
View Patent ↗
Granted: Sep 22, 1998
Filed: Oct 10, 1996
Inventors
Chieh-Min Cheng
Rong-Chang Liang
Yi-Hua Tsao
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.