Inventor · disambiguated record
Sidney Dantuma Johnston
Also filed as: JOHNSTON SIDNEY DANTUMA
7 granted patents·1 pending application·12 citations·filing 2015–2025
74Inventor score
Top patents by PatentIndex Score
8 records- 0192US10041321B2Downhole tool with a propellant chargeSPEX ENGINEERING UK LTD·Filed 2015·Granted Aug 7, 2018·12 cites·17 claims
- 0272US2025243723A1Tool for severing a downhole tubular by a stream of combustion productsSPEX CORP HOLDINGS LTD·Filed 2025·Application pending·0 cites
- 0363US11359450B2Downhole tool with a propellant chargeSPEX CORPORATE HOLDINGS LTD·Filed 2020·Granted Jun 14, 2022·0 cites·33 claims
- 0457US10954734B2Downhole tool with a propellant chargeSPEX CORPORATE HOLDINGS LTD·Filed 2018·Granted Mar 23, 2021·0 cites·7 claims
- 0555US11332993B2Cutting toolSPEX ENGINEERING UK LTD·Filed 2019·Granted May 17, 2022·0 cites·16 claims
- 0645US10550656B2Cutting toolSPEX ENGINEERING UK LTD·Filed 2015·Granted Feb 4, 2020·0 cites·21 claims
- 0740US12297709B2Tool for severing a downhole tubular by a stream of combustion productsSPEX CORP HOLDINGS LTD·Filed 2017·Granted May 13, 2025·0 cites·29 claims
- 0837US11215024B2Tool with propellant sectionsSPEX CORP HOLDINGS LTD·Filed 2017·Granted Jan 4, 2022·0 cites·20 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →