Ruler teaching apparatus

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Description

FIG. 1 is a top perspective view of a ruler teaching apparatus showing my new design;

FIG. 2 is a front elevational view of the ruler teaching apparatus according to the present invention;

FIG. 3 is a rear elevational view of the ruler teaching apparatus according to the present invention;

FIG. 4 is a top plan view of the ruler teaching apparatus according to the present invention;

FIG. 5 is a bottom plan view of the ruler teaching apparatus according to the present invention;

FIG. 6 is a left side elevational view of the ruler teaching apparatus according to the present invention; and,

FIG. 7 is a right side elevational view of the ruler teaching apparatus according to the present invention.

Referenced Cited
U.S. Patent Documents
D206551 December 1966 Nystrom
D229223 November 1973 Corn
D288538 March 3, 1987 Cabaniss, III
D290397 June 16, 1987 Starkey
D339305 September 14, 1993 Klein
703208 June 1902 Lawrence
747380 December 1903 Cooke
1659739 February 1928 Kuhlman
1699847 January 1929 Kuhlman
1888305 November 1932 Berger
2291552 July 1942 Lalonde
2402658 June 1946 Nedela
2422745 June 1947 Ost
2456676 December 1948 Chowns
3258844 July 1966 Godman
3465453 September 1969 Sganga
3837569 September 1974 Bradbury et al.
3949491 April 13, 1976 Harte
4144657 March 20, 1979 Dumovich
Foreign Patent Documents
1226055 1971 GBX
Other references
  • Cenco Educational Catalog, 1969, p. 1, Element #72695. Welch Physics Digest, Apr. 1951 p. 27 Vernier Caliper on top of page.
Patent History
Patent number: D351858
Type: Grant
Filed: Mar 3, 1993
Date of Patent: Oct 25, 1994
Inventor: John J. Jones (St. Joe, IN)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Pamela Burgess
Attorney: George Pappas
Application Number: 0/5,388