Granted Patent
Utility
US 4,343,652 · App. 06/179,415
Chromogen solutions for pressure-sensitive mark-recording systems
Inventors:
Pierre J. Allart, Claude A. Guillaume
Patented Case
View Patent ↗
Granted: Aug 10, 1982
Filed: Aug 18, 1980
Inventors
Pierre J. Allart
Claude A. Guillaume
Assignee (at issue)
Monsanto Europe S.A.
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.