Inventor

NAGANAWA Shigemi

JP4 patents

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

UNIV AKITA

1 patent

US11970654B2Apr 30, 2024

Drilling fluid, drilling method, and drilling fluid additive

UNIV AKITA0 citations54

AIST

1 patent

US11326433B2May 10, 2022

Fracturing method and depressurizing device used for same

AIST0 citations54

UNIV TOKYO

1 patent

US11230890B2Jan 25, 2022

Well drilling bit and well drilling method using the same

UNIV TOKYO1 citations53

TEISEKI DRILLING CO LTD

1 patent

US10801299B2Oct 13, 2020

Packer

TEISEKI DRILLING CO LTD0 citations35