Granted Patent
Utility
US 5,637,435 · App. 07/682,962
Negative type lithographic printing plate
Inventor:
Shigeki Shimizu
Patented Case
View Patent ↗
Granted: Jun 10, 1997
Filed: Apr 10, 1991
Inventor
Shigeki Shimizu
Assignee (at issue)
MITSUBISHI CHEMICAL 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.