Beijing
China
3
2016-10-27
The entities that hold a legal rights for patent applications filed by inventor Li Ningbo:
Ningbo Li from Beijing, CN has applied for patents for these inventions. The list has both pending applications and granted patents:
Combination test method by using argon as gross-leak test tracer gas and using helium as fine-leak test tracer gas
#2 | 2015-03-12Method of cumulative helium mass spectrometric combination test by using argon as gross-leak tracer gas
#3 | 2014-08-07Method for helium mass spectrometric fine-leak test based on quantitative determination of maximum test-waiting time
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