G06C 1/00

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
2024/0295,897 MULTIPLICATION ABACUS DEVICEMay 13, 24Sep 05, 24Not available
2021/0157,354 ELECTRONIC ABACUSNov 02, 18May 27, 21Not available
2021/0026,395 ADAPTABLE EDUCATIONAL DEVICEJul 26, 19Jan 28, 21Not available
2017/0102,729 MANUAL CALCULATING DEVICEOct 08, 15Apr 13, 17Not available
2015/0293,554 EDUCATIONAL APPARATUS FOR LEARNING MATH AS WELL AS COMPONENTS THEREFOR AND METHODS INCLUDING THE SAMEApr 03, 15Oct 15, 15LEARNTOOLS INC.
2011/0220,709 Improved Counter DeviceJun 08, 07Sep 15, 11Not available
2008/0280,273 Multipurpose AbacusMay 24, 06Nov 13, 08Not available
2008/0171,310 Swim lap counterJan 17, 07Jul 17, 08Not available
2008/0149,699 HANDHELD COLONY COUNTERDec 28, 06Jun 26, 08HEATHROW SCIENTIFIC LLC
2003/0148,250 Teaching aidDec 17, 02Aug 07, 03Direct Educational Services Limited
2002/0197,590 Arrangement for abacus-like calculationApr 22, 02Dec 26, 02Not available
2001/0055,746 Device and method for teaching mathematical properties associated with even and odd numbersJun 26, 01Dec 27, 01MATHTREE, INC.