Granted Patent
Utility
US 4,658,458 · App. 06/852,408
Rotary brush sweeper with mechanism for brush height adjustment
Inventors:
Robert C. Berfield, R. Lent Crevling, Jr., Ronald F. Meland, Richard M. Fegan
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Apr 16, 1986
Inventors
Robert C. Berfield
R. Lent Crevling, Jr.
Ronald F. Meland
Richard M. Fegan
Assignee (at issue)
SHOP VAC 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.