IP Library › Granted Patent US 4,400,843
Granted Patent Utility
US 4,400,843 · App. 06/310,116

Rotary floor cleaner

Inventor: Roland A. Blomgren
Patented Case View Patent ↗
Granted: Aug 30, 1983 Filed: Oct 9, 1981
Inventor
Roland A. Blomgren
Assignee (at issue)
ServiceMaster Industries, Inc.

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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,400,843
App. No.
06/310,116
Filed
1981-10-09
Granted
1983-08-30
Kind
A