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Jan-Gunnar Hedlund
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Sandviken, SE
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Patents Grants
last 30 patents
Information
Patent Grant
Rock drill having an internal flushing channel
Patent number
6,102,141
Issue date
Aug 15, 2000
Sandvik AB
H.ang.kan Engstrom
E21 - EARTH DRILLING MINING
Information
Patent Grant
Down-the-hole drill tool for drilling in advance of a casing tube
Patent number
5,284,216
Issue date
Feb 8, 1994
Sandvik AB
Anders Brungs
E21 - EARTH DRILLING MINING
Information
Patent Grant
Tool for cutting solid material
Patent number
5,112,165
Issue date
May 12, 1992
Sandvik AB
Jan-Gunnar Hedlund
B28 - WORKING CEMENT, CLAY, OR STONE
Information
Patent Grant
Tool for cutting solid material
Patent number
5,074,623
Issue date
Dec 24, 1991
Sandvik AB
Jan-Gunnar Hedlund
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information
Patent Grant
Valve openable in response to displacement of a cutting tool
Patent number
4,976,496
Issue date
Dec 11, 1990
Sandvik AB
Jan-Gunnar Hedlund
E21 - EARTH DRILLING MINING
Information
Patent Grant
Tool for breaking, cutting or working of solid materials
Patent number
4,921,310
Issue date
May 1, 1990
Jan-Gunnar Hedlund
E21 - EARTH DRILLING MINING
Information
Patent Grant
Method and device for working of road surfaces
Patent number
4,784,517
Issue date
Nov 15, 1988
Sandvik Aktiebolag
Sven A. Bergqvist
E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information
Patent Grant
Device for supplying fluid at tools for breaking solid material
Patent number
4,733,915
Issue date
Mar 29, 1988
Santrade Limited
Jan-Gunnar Hedlund
E21 - EARTH DRILLING MINING
Information
Patent Grant
Device for supplying fluid to a tool for breaking hard material
Patent number
4,705,321
Issue date
Nov 10, 1987
Santrade Limited
Jan-Gunnar Hedlund
E21 - EARTH DRILLING MINING