Granted Patent
Utility
US 4,920,604 · App. 07/371,295
Automatic vacuum bowling lane stripper
Inventors:
Donald E. Ingermann, Ronald L. Smith, Stephen F. Caffrey, Lonney J. Steinhoff
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Jun 26, 1989
Inventors
Donald E. Ingermann
Ronald L. Smith
Stephen F. Caffrey
Lonney J. Steinhoff
Assignee (at issue)
Century International 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.