Inventor · disambiguated record
Fredrik Egerstrom
Also filed as: EGERSTROM FREDRIK · EGERSTRÖM FREDRIK
5 granted patents·1 pending application·40 citations·filing 2002–2023
74Inventor score
Technology areasE21B
Top patents by PatentIndex Score
6 records- 0160US6994175B2Hydraulic drill stringWASSARA AB·Filed 2003·Granted Feb 7, 2006·31 cites·38 claims
- 0243US2025314131A1Pressurized liquid driven downhole drilling machine with a device for soft start from a flush position and impact piston making part of such a downhole drilling machineLKAB WASSARA AB·Filed 2023·Application pending·0 cites
- 0337US10030449B2Apparatus for drilling and lining a boreholeLKAB WASSARA AB·Filed 2013·Granted Jul 24, 2018·0 cites·13 claims
- 0437US7159674B2Method and device for directional down-hole drillingWASSARA AB·Filed 2003·Granted Jan 9, 2007·6 cites·4 claims
- 0534US7040421B2Liquid driven downhole drilling machineWASSARA AB·Filed 2002·Granted May 9, 2006·3 cites·1 claims
- 0632US12173584B2Drive device for rotatable operation of a drill bit of a down-the-hole hammerLKAB WASSARA AB·Filed 2021·Granted Dec 24, 2024·0 cites·10 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →