Inventor · disambiguated record

Quingkun Zeng

Also filed as: ZENG QUINGKUN

1 granted patent·53 citations·filing 1993–1993

49Inventor score

Technology areasE21B

Files withOIL PROD TECH INST SHENGLI PET1

Top patents by PatentIndex Score

1 record

0160US5375657AChain long-stroke oil-well pumping unitOIL PROD TECH INST SHENGLI PET·Filed 1993·Granted Dec 27, 1994·53 cites·20 claims

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