Granted Patent
Utility
US 4,367,564 · App. 06/254,174
Sweeper bristle and method of making
Inventor:
John D. Holley
Patented Case
View Patent ↗
Granted: Jan 11, 1983
Filed: Apr 14, 1981
Inventor
John D. Holley
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.