Torbjorn Hartzell

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Stockholm, SE

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Patents Grantslast 30 patents

Information Patent Grant
Rock drill bit and cutting inserts
- Patent number 6,119,798
- Issue date Sep 19, 2000
- Sandvik AB
- Udo Fischer
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rock drill bit and cutting inserts
- Patent number 5,881,828
- Issue date Mar 16, 1999
- Sandvik AB
- Udo Fischer
- E21 - EARTH DRILLING MINING
Information Patent Grant
Cemented carbide body with increased wear resistance
- Patent number 5,856,626
- Issue date Jan 5, 1999
- Sandvik AB
- Udo Fischer
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Asymmetrical button insert for rock drilling
- Patent number D371374
- Issue date Jul 2, 1996
- Sandvik AB
- Udo Fischer
- D15 - Machines not elsewhere specified
Information Patent Grant
Asymmetrical button insert for rock drilling
- Patent number D371146
- Issue date Jun 25, 1996
- Sandvik AB
- Udo Fischer
- D15 - Machines not elsewhere specified