Obstruction square

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Description

FIG. 1 is a three dimensional perspective view of the obstruction square of this design illustrating the cutaway portion to overcome corner obstructions;

FIG. 2 is a side view of the obstruction square illustrating the cutaway portion to overcome corner obstructions;

FIG. 3 is a top view of the obstruction square; and,

FIG. 4 is a front view of the obstruction square.

Referenced Cited
U.S. Patent Documents
134919 January 1873 Moore
217967 July 1879 White
2802278 August 1957 Knefel
3492715 February 1970 Maton
4338725 July 13, 1982 Martin et al.
4736525 April 12, 1988 Deason
4773163 September 27, 1988 Wolford, Jr.
4805315 February 21, 1989 Nesbitt
4914825 April 10, 1990 Howard
Patent History
Patent number: D348015
Type: Grant
Filed: Jul 6, 1993
Date of Patent: Jun 21, 1994
Inventors: Henry D. Durst (Fulton, MO), Steve A. Sheehan (Kellyville, OK)
Primary Examiner: Alan P. Douglas
Assistant Examiner: Antoine D. Davis
Attorney: Richard J. Grundstrom
Application Number: 0/10,319
Classifications
Current U.S. Class: Template Or Comparator Gauge (6) (D10/64)