Granted Patent
Utility
US 4,955,138 · App. 07/297,414
Utility blade scraper
Inventors:
David R. Henke, Steven Thompson
Patented Case
View Patent ↗
Granted: Sep 11, 1990
Filed: Jan 13, 1989
Inventors
David R. Henke
Steven Thompson
Assignee (at issue)
Warner Manufacturing Company
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.