Erkki A. Ruuskanen

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Savonlinna, FI

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Patents Grantslast 30 patents

Information Patent Grant
Apparatus for treating pulp
- Patent number 5,139,671
- Issue date Aug 18, 1992
- A. Ahlstrom Corporation
- Kaj O. Henricson
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
Information Patent Grant
Apparatus for treating pulp
- Patent number 4,952,314
- Issue date Aug 28, 1990
- A. Ahlstrom Corporation
- Kaj O. Henricson
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
Information Patent Grant
Packing arrangement for sealing the surface of a rotary drum like o...
- Patent number 4,795,170
- Issue date Jan 3, 1989
- Enso-Gutzeit OY
- Seppo Kokkonen
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...