Granted Patent
Utility
US 4,215,191 · App. 06/009,506
Light-sensitive vesicular recording materials and process of using
Inventor:
John Kwok
Patented Case
View Patent ↗
Granted: Jul 29, 1980
Filed: Feb 5, 1979
Inventor
John Kwok
Assignee (at issue)
Bexford Limited
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.