P

Inventor

JOHNSTON SIDNEY DANTUMA

GB7 patents
⚠️ This page may combine multiple inventors who share the name “JOHNSTON SIDNEY DANTUMA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

SPEX ENGINEERING UK LTD

3 patents
US10041321B2Aug 7, 2018

Downhole tool with a propellant charge

SPEX ENGINEERING UK LTD12 citations81
US11332993B2May 17, 2022

Cutting tool

SPEX ENGINEERING UK LTD0 citations56
US10550656B2Feb 4, 2020

Cutting tool

SPEX ENGINEERING UK LTD0 citations46

SPEX CORPORATE HOLDINGS LTD

2 patents
US11359450B2Jun 14, 2022

Downhole tool with a propellant charge

SPEX CORPORATE HOLDINGS LTD0 citations59
US10954734B2Mar 23, 2021

Downhole tool with a propellant charge

SPEX CORPORATE HOLDINGS LTD0 citations59

SPEX CORP HOLDINGS LTD

2 patents
US11215024B2Jan 4, 2022

Tool with propellant sections

SPEX CORP HOLDINGS LTD0 citations48
US12297709B2May 13, 2025

Tool for severing a downhole tubular by a stream of combustion products

SPEX CORP HOLDINGS LTD0 citations46