Granted Patent
Utility
US 4,490,910 · App. 06/400,443
Cutting head for string trimmer
Inventors:
Charles A. Mattson, Richard Landy
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: Jul 21, 1982
Inventors
Charles A. Mattson
Richard Landy
Assignee (at issue)
Allegretti & 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.