Granted Patent
Utility
US 4,271,261 · App. 06/106,010
Developer composition for lithographic printing plates
Inventors:
Shigeki Shimizu, Hiroshi Ide
Patented Case
View Patent ↗
Granted: Jun 2, 1981
Filed: Dec 21, 1979
Inventors
Shigeki Shimizu
Hiroshi Ide
Assignee (at issue)
Mitsubishi Chemical Industries, Ltd.
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.