Granted Patent
Utility
US 4,777,852 · App. 06/914,739
Ratcheting screwdriver
Inventors:
Timm Herman, Donald J. Caldwell, Allan J. Bliemeister, Eric T. Gustafson, Mark S. Bakula
Patented Case
View Patent ↗
Granted: Oct 18, 1988
Filed: Oct 2, 1986
Inventors
Timm Herman
Donald J. Caldwell
Allan J. Bliemeister
Eric T. Gustafson
Mark S. Bakula
Assignee (at issue)
Snap-on Tools 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.