Perspective drawing instrument

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Description

FIG. 1 is a top plan view of a perspective drawing instrument showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is an edge view thereof.

Referenced Cited
U.S. Patent Documents
2667694 February 1954 McQuaid, Sr. et al.
2895223 July 1959 Fields
2981004 April 1961 Edlund
Foreign Patent Documents
432688 October 1911 FRX
462469 March 1951 ITX
Patent History
Patent number: D253956
Type: Grant
Filed: May 2, 1977
Date of Patent: Jan 15, 1980
Inventor: George E. Edlund (Mountain View, CA)
Primary Examiner: Joel Stearman
Assistant Examiner: George P. Word
Attorney: Linval B. Castle
Application Number: 5/793,192
Classifications
Current U.S. Class: Equipment For Writing, Drawing, Or For Fine Arts (D19/35); Geometric (5) (D10/61); Angle Or Direction (7) (D10/65)
International Classification: D1906;