Rakennusvalmiste Oy

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Patents Grantslast 30 patents

Information Patent Grant
Method of compacting concrete by mutually synchronized reciprocatin...
- Patent number 4,751,033
- Issue date Jun 14, 1988
- Rakennusvalmiste Oy
- Heikki Kankkunen
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Ram casting machine for concrete slabs
- Patent number 4,674,970
- Issue date Jun 23, 1987
- Rakennusvalmiste Oy
- Heikki I. Kankkunen
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Concrete slab extruder with shear-action coring members
- Patent number 4,674,971
- Issue date Jun 23, 1987
- Rakennusvalmiste Oy
- Heikki I. Kankkunen
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Electric heater
- Patent number D287750
- Issue date Jan 13, 1987
- Rakennusvalmiste Oy
- Ilkka Hamalainen
- D23 - Environmental heating and cooling
Information Patent Grant
Electric heater
- Patent number D287751
- Issue date Jan 13, 1987
- Rakennusvalmiste Oy
- Ilkka Hamalainen
- D23 - Environmental heating and cooling