Thord I. Engstrom

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S-950 18 Bensbyn, SE

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for laying drains in frost-susceptible ground,...
- Patent number 4,553,876
- Issue date Nov 19, 1985
- Oscar S. Arntyr
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Method and device for reducing the risk of freezing of surface-wate...
- Patent number 4,486,122
- Issue date Dec 4, 1984
- Oscar S. Arntyr
- E03 - WATER SUPPLY SEWERAGE
Information Patent Grant
Method and apparatus for restricting local variations in ground lev...
- Patent number 4,475,844
- Issue date Oct 9, 1984
- Oscar S. Arntyr
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Filtering and collecting device for water drains
- Patent number 4,419,232
- Issue date Dec 6, 1983
- Oscar S. Arntyr
- E03 - WATER SUPPLY SEWERAGE
Information Patent Grant
Arrangement in rain-water drains or manholes
- Patent number 4,325,572
- Issue date Apr 20, 1982
- Oscar S. Arntyr
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...