Trigonometric function overlay

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Description

FIG. 1 is a perspective view showing a trigonometric function overlay, according to my new design, showing movable arms of the device in one position of use;

FIG. 2 is a front plan view thereof;

FIG. 3 is a rear plan view thereof;

FIG. 4 is a left edge view thereof;

FIG. 5 is a right edge view thereof;

FIG. 6 is a top edge view thereof;

FIG. 7 is a bottom edge view thereof;

FIG. 8 is a perspective view similar to FIG. 1showing a modified embodiment thereof;

FIG. 9 is another perspective view similar to FIG. 8, showing a further modified embodiment thereof;

FIG. 10 is another perspective view similar to FIG. 8, showing still further modified embodiment thereof; and,

FIG. 11 is another perspective view similar to FIG. 10, showing the embodiment of FIG. 10 in a different position, a position of storage.

Referenced Cited
U.S. Patent Documents
D209775 January 1968 Baker
2557965 June 1951 Hilsenrath et al.
5013149 May 7, 1991 Downum et al.
Other references
  • William T. Stokes; Gems of Geometry; Trigonometric Function Generator; .RTM.1978; pp. 85-86.
Patent History
Patent number: D342685
Type: Grant
Filed: Jun 11, 1992
Date of Patent: Dec 28, 1993
Inventor: William T. Stokes (Sunnyvale, CA)
Primary Examiner: Alan P. Douglas
Assistant Examiner: Antoine D. Davis
Attorney: Thomas M. Freiburger
Application Number: 7/897,513