Adjustable unit circle board for evaluating trigonometric functions and their signs

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Description

FIG. 1 is a front elevational view of the adjustable unit circle board for evaluating trigonometric functions and their signs showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side view thereof

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D342685 December 28, 1993 Stokes
3386190 June 1968 Savin et al.
5114347 May 19, 1992 Camp
Patent History
Patent number: D409098
Type: Grant
Filed: Jul 28, 1997
Date of Patent: May 4, 1999
Inventor: Shoshana Michaeli (Fair Lawn, NJ)
Primary Examiner: Antoine Duval Davis
Application Number: 0/74,208
Classifications
Current U.S. Class: Template Or Comparator Gauge (6) (D10/64)
International Classification: 1004;