Granted Patent
Utility
US 4,335,510 · App. 06/199,563
String trimmer
Inventors:
Albert R. Close, Winton Oster
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Oct 22, 1980
Inventors
Albert R. Close
Winton Oster
Assignee (at issue)
BLACK & DECKER 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.