Patent

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Patent:US5704790
06.01.1998 Moses, Robert Parris : Methods of playing games which enhance mathematical understanding
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Patent:US5708260
13.01.1998 Maier, Steven F. (Chapel Hill, NC), Johnson, Forrest B. : Slide-rule calculator for computing a salary replacement value
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Patent:US5717193
10.02.1998 Marcelo, Ruben V. (765 Bronx River Rd., Bronxville, NY : Method and apparatus for determining the exponential powers of i
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Patent:US5725380
10.03.1998 Kennelly, Kim (140 Ingrid Pl., Oldsmar, FL 34677) : Combination writing board and abacus
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Patent:US5731572
24.03.1998 Winn, Kirk T. (Redondo Beach, CA) : Six sigma calculator
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Patent:US5731573
24.03.1998 Allen, Richard A. (29 Devons St., Concord, MA 01742), : Tide calculator
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Patent:US5732490
31.03.1998 Hydary, Mainul H. : Perpetual calendar
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Patent:US5743741
28.04.1998 Fife, Patricia (1331 Traynor Rd., Concord, CA 94520) : Math jigsaw puzzle
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Patent:US5748502
05.05.1998 Akio Kubo Hiroshi Nemoto Ushikata Mfg. Co. Ltd : Apparatus for measuring a figure having a calibration mode and method for calibrating a measuring apparatus
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Patent:US5753896
19.05.1998 Rufolo Lucio Dr Seleburni Sas : Acid-base equilibrium slide-rule
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Patent:US5769639
23.06.1998 Foster, Anne (P.O. Box 7241, Port Aransas, TX 78373) : Multi-educational device
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Patent:US5816822
06.10.1998 Safavi, Farrokh Western Washington University : Methods and apparatus for instructing students of statistics
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Patent:US5823783
20.10.1998 Adams, Mary Katherine : Rotating pie graph: mathematics learning tool
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Patent:US5836587
17.11.1998 Druce, Harry Frederick : Playing cards for an educational game