Granted Patent
Utility
US 4,562,138 · App. 06/642,695
Nitrogen-containing heterocyclic blocked mercapto development inhibitors
Inventors:
Morito Uemura, Kaoru Onodera
Patented Case
View Patent ↗
Granted: Dec 31, 1985
Filed: Aug 21, 1984
Inventors
Morito Uemura
Kaoru Onodera
Assignee (at issue)
Konishiroku Photo Industry Co., 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.