Inventor · disambiguated record
Yu-Hwa Chang
Also filed as: CHANG YU-HWA
5 granted patents·54 citations·filing 2007–2021
79Inventor score
Technology areasC10G
Files withAXENS NORTH AMERICA1CHANG YU-HWA1HEADWATERS HEAVY OIL LLC1HEADWATERS TECH INNOVATION LLC1LOTT ROGER K1
Top patents by PatentIndex Score
5 records- 0194US8309041B2Systems for increasing catalyst concentration in heavy oil and/or coal resid hydrocrackerLOTT ROGER K·Filed 2011·Granted Nov 13, 2012·25 cites·34 claims
- 0290US8557105B2Methods for increasing catalyst concentration in heavy oil and/or coal resid hydrocrackerHEADWATERS HEAVY OIL LLC·Filed 2012·Granted Oct 15, 2013·9 cites·35 claims
- 0385US8034232B2Methods for increasing catalyst concentration in heavy oil and/or coal resid hydrocrackerHEADWATERS TECH INNOVATION LLC·Filed 2007·Granted Oct 11, 2011·13 cites·28 claims
- 0478US9790440B2Methods for increasing catalyst concentration in heavy oil and/or coal resid hydrocrackerCHANG YU-HWA·Filed 2011·Granted Oct 17, 2017·7 cites·25 claims
- 0542US11549072B1Overpressure protection in hot high pressure processing systems in multi-stage up-flow reactor systemsAXENS NORTH AMERICA·Filed 2021·Granted Jan 10, 2023·0 cites·6 claims
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