CN202887531U - 多功能三角函数值助解数学教具 - Google Patents
多功能三角函数值助解数学教具 Download PDFInfo
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- CN202887531U CN202887531U CN 201220641257 CN201220641257U CN202887531U CN 202887531 U CN202887531 U CN 202887531U CN 201220641257 CN201220641257 CN 201220641257 CN 201220641257 U CN201220641257 U CN 201220641257U CN 202887531 U CN202887531 U CN 202887531U
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CN 201220641257 CN202887531U (zh) | 2012-11-17 | 2012-11-17 | 多功能三角函数值助解数学教具 |
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C14 | Grant of patent or utility model | ||
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Owner name: HEIHE UNIVERSITY Free format text: FORMER OWNER: WANG FENGLING Effective date: 20130815 Free format text: FORMER OWNER: CHEN QINGLIN SUN LINAN Effective date: 20130815 |
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C41 | Transfer of patent application or patent right or utility model | ||
C53 | Correction of patent for invention or patent application | ||
CB03 | Change of inventor or designer information |
Inventor after: Wang Fengling Inventor after: Chen Qinglin Inventor after: Sun Linan Inventor after: Wang Yanan Inventor before: Wang Fengling |
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COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: WANG FENGLING TO: WANG FENGLING CHEN QINGLIN SUN LINAN WANG YANAN |
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TR01 | Transfer of patent right |
Effective date of registration: 20130815 Address after: 164300 Heihe education science and technology zone, Xueyuan Road, No. 1, Heihe University, Heilongjiang Patentee after: Heihe University Address before: 164300 Department of mathematics, Heihe University, Xueyuan Road 1, Heihe education science and technology zone, Heilongjiang Patentee before: Wang Fengling Patentee before: Chen Qinglin Patentee before: Sun Linan |
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C17 | Cessation of patent right | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20131117 |