Ruler/mathematical aid

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Description

FIG. 1 is a top plan view of a ruler/mathematical aid showing our new design;

FIG. 2 is a right side elevational view, the left side elevational view being identical;

FIG. 3 is a front elevational view, the rear elevational view being identical; and

FIG. 4 is a bottom plan view thereof.

FIG. 5 shows the bottom plan view with cutout shapes thereon which is identical to the top plan view in FIG. 1 and is flat and unornamented.

Referenced Cited
U.S. Patent Documents
D135722 May 1943 Vetter
D137459 March 1944 Colmery
D148434 January 1948 Owen, Jr.
D207794 May 1967 Cherrington
4190960 March 4, 1980 Warner
Foreign Patent Documents
114750 February 1942 AUX
45155 August 1963 AUX
50974 August 1967 AUX
649815 January 1951 GBX
Other references
  • Dietzgen, Protractor Scale and Rules, 1946, p. 275. Visual Systems, Scales, 86/87, pp. 196, 195.
Patent History
Patent number: D316978
Type: Grant
Filed: Dec 9, 1987
Date of Patent: May 21, 1991
Assignee: Aesthetic Holdings Pty. Ltd. (Pinjarra)
Inventors: Maureen T. Chesson (Winthrop), Phillipa G. Banks (Mount Pleasant)
Primary Examiner: Nelson C. Holtje
Assistant Examiner: Antoine D. Davis
Law Firm: Gipple & Hale
Application Number: 7/130,671
Classifications
Current U.S. Class: Combined (D10/62)