Slide chart

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Description

FIG. 1 is a front elevational view of a slide chart showing my new design;

FIG. 2 is a right edge elevational view thereof;

FIG. 3 is a front elevational view of a slide chart showing a modified form of my new design;

FIG. 4 is a right edge elevational view thereof;

FIG. 5 is a front elevational view of a slide chart showing another modified form of my new design; and

FIG. 6 is a right edge elevational view thereof.

The back of each form is a mirror image of the front.

Referenced Cited
U.S. Patent Documents
D231796 June 1974 Schwarz et al.
2049038 July 1936 Andersen
3562940 February 1971 Gulbransen, Sr. et al.
3837569 September 1974 Bradbury et al.
3933305 January 20, 1976 Murphy
Patent History
Patent number: D253830
Type: Grant
Filed: Jun 20, 1977
Date of Patent: Jan 1, 1980
Inventor: R. Wallace Wright (Hudson, Quebec)
Primary Examiner: Louis S. Zarfas
Attorney: Alan Swabey
Application Number: 5/801,352
Classifications
Current U.S. Class: Slide Rule Type (D18/9)
International Classification: D1999;