Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate
2002-12-17
2004-01-13
Ackun, Jacob K. (Department: 3712)
Education and demonstration
Mathematics
Arithmetic
C434S402000
Reexamination Certificate
active
06676415
ABSTRACT:
The invention relates to teaching aids of the kind comprising a frame, a plurality of elongate rods mounted horizontally in the frame and vertically spaced from each other and a plurality of number-bearing carriers supported on each rod. In a known aid, the carriers can be flipped between two different positions so as to present one or other of their two sides.
The present invention provides a teaching aid in which the number-bearing carriers are in the form of polyhedral blocks which can be selectively located in at least three discrete positions.
The invention provides a teaching aid comprising: a frame; a plurality of elongate rods mounted horizontally in the frame and spaced vertically from each other; and a plurality of polyhedral blocks rotatably mounted on each rod; wherein means are provided to releasably hold each polyhedral block in at least three discrete rotary positions on its respective rod.
REFERENCES:
patent: 422612 (1890-03-01), Neuhaus
patent: 3010227 (1961-11-01), Glass
patent: 3710456 (1973-01-01), Jerman
patent: 4026043 (1977-05-01), Caruso
patent: 4233757 (1980-11-01), Narcise
patent: 5382165 (1995-01-01), Knox
patent: 5423682 (1995-06-01), Hildebrandt
patent: 199923783 (1999-10-01), None
patent: 1191718 (1970-05-01), None
Corresponding GB patent application Search Report, dated Sep. 18, 2000.
International Search Report of PCT/GB01/00980, dated May 16, 2001.
International Preliminary Examination Report of PCT/GB01/00980, dated Jun. 24, 2002.
Hiskett Graham
Walker Roger
Ackun Jacob K.
Christie Parker & Hale LLP
Direct Educational Services Limited
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