Granted Patent
Utility
US 4,305,821 · App. 06/215,588
Doctor blade lifter over belt seam
Inventors:
Robert E. Crandall, Bert Krivec
Patented Case
View Patent ↗
Granted: Dec 15, 1981
Filed: Dec 11, 1980
Inventors
Robert E. Crandall
Bert Krivec
Assignee (at issue)
Envirex, Inc.
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.