Granted Patent
Utility
US 4,411,069 · App. 06/376,470
Spoolless string trimmer head
Inventors:
Albert R. Close, Winton Oster
Patented Case
View Patent ↗
Granted: Oct 25, 1983
Filed: May 10, 1982
Inventors
Albert R. Close
Winton Oster
Assignee (at issue)
McCulloch 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.