Inventor

JI HONGFEI

CN4 patents

⚠️ This page may combine multiple inventors who share the name “JI HONGFEI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

CHINA NAT PETROLEUM CORP

2 patents

US12497331B2Dec 16, 2025

High-strength Portland cement slurry for ultra-high temperature cementing, preparation method therefor and application thereof

CHINA NAT PETROLEUM CORP0 citations56

US12391861B2Aug 19, 2025

Cement slurry system, preparation method therefor and use thereof

CHINA NAT PETROLEUM CORP0 citations47

JI HONGFEI

1 patent

US8888629B2Nov 18, 2014

Bicycle sprocket assembly with chain protector

JI HONGFEI15 citations72

PETROCHINA CO LTD

1 patent

US11926787B2Mar 12, 2024

Well cementing method for improving well cementing quality by controlling hydration heat of cement slurry

PETROCHINA CO LTD0 citations45