Technisch Handels- en Adviesbureau van Geffen B.V.

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Apeldoorn, NL

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Patents Grantslast 30 patents

Information Patent Grant
Method of interconnecting several parts, such as a piece of tubing...
- Patent number 4,260,094
- Issue date Apr 7, 1981
- Technisch Handels- en Adviesbureau van Geffen B.V.
- Christiaan A. Stroo
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Rotatable piercing tools for forming bossed holes
- Patent number 4,185,486
- Issue date Jan 29, 1980
- Technisch Handels- en Adviesbureau van Geffen B.V.
- Johannes A. van Geffen
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Rotatable piercing tools for forming holes surrounded each by a bos...
- Patent number 4,177,659
- Issue date Dec 11, 1979
- Technisch Handels- en Adviesbureau van Geffen B.V.
- Johannes A. van Geffen
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Methods and apparatuses for forming by frictional heat and pressure...
- Patent number 4,175,413
- Issue date Nov 27, 1979
- Technisch Handels- en Adviesbureau van Geffen B.V.
- Johannes A. van Geffen
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...