Roof insulation washer

- Illinois Tool Works Inc.
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Description

FIG. 1 is an isometric view of a roof insulation washer showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a sectional view taken in the direction of the arrows on line 3--3 of FIG. 2.

Referenced Cited
U.S. Patent Documents
D236428 August 1975 Stewart et al.
D237681 November 1975 Knohl et al.
3238731 March 1966 Seifert et al.
4112693 September 12, 1978 Collin
Patent History
Patent number: D263928
Type: Grant
Filed: Nov 7, 1979
Date of Patent: Apr 20, 1982
Assignee: Illinois Tool Works Inc. (Chicago, IL)
Inventor: George G. Dewey (Prospect Heights, IL)
Primary Examiner: B. J. Bullock
Attorney: Thomas W. Buckman
Application Number: 6/92,160
Classifications
Current U.S. Class: D/8399; D/8354
International Classification: D0808;