CN1297477C - 乙炔碳化制备纳米碳化钨粉的方法 - Google Patents
乙炔碳化制备纳米碳化钨粉的方法 Download PDFInfo
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- CN1297477C CN1297477C CNB2005100051748A CN200510005174A CN1297477C CN 1297477 C CN1297477 C CN 1297477C CN B2005100051748 A CNB2005100051748 A CN B2005100051748A CN 200510005174 A CN200510005174 A CN 200510005174A CN 1297477 C CN1297477 C CN 1297477C
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CNB2005100051748A CN1297477C (zh) | 2005-02-01 | 2005-02-01 | 乙炔碳化制备纳米碳化钨粉的方法 |
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CNB2005100051748A CN1297477C (zh) | 2005-02-01 | 2005-02-01 | 乙炔碳化制备纳米碳化钨粉的方法 |
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CN1654323A CN1654323A (zh) | 2005-08-17 |
CN1297477C true CN1297477C (zh) | 2007-01-31 |
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EP2521799A1 (en) * | 2010-01-08 | 2012-11-14 | Jayakannan Arumugavelu | A process for recycling of tungsten carbide alloy |
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C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Beijing Research Institute of Powder Metallurgy Co., Ltd. Assignor: University of Science and Technology Beijing Contract fulfillment period: 2007.8.6 to 2015.8.6 contract change Contract record no.: 2008990000637 Denomination of invention: Method for preparing nanometer tungsten carbide powder by acetylene carbonization Granted publication date: 20070131 License type: Exclusive license Record date: 2008.10.9 |
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LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.8.6 TO 2015.8.6; CHANGE OF CONTRACT Name of requester: BEIJING CITY POWDER METALLURGY RESEARCH INSTITUTE Effective date: 20081009 |
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C17 | Cessation of patent right | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070131 Termination date: 20100201 |