IP Library › Granted Patent US 4,270,238
Granted Patent Utility
US 4,270,238 · App. 06/058,485

Cleaning tool

Inventors: Robert L. Shallenberg, Roland A. Blomgren
Patented Case View Patent ↗
Granted: Jun 2, 1981 Filed: Jul 18, 1979
Inventors
Robert L. Shallenberg
Roland A. Blomgren
Assignee (at issue)
ServiceMaster Industries, Inc.

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Quick Facts
Patent No.
US 4,270,238
App. No.
06/058,485
Filed
1979-07-18
Granted
1981-06-02
Kind
A