Granted Patent
Utility
US 4,272,213 · App. 06/056,208
Extendible screeds
Inventor:
Roy R. McGovarin
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Jul 10, 1979
Inventor
Roy R. McGovarin
Assignee (at issue)
BLAW-KNOX CORPORATION
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.