Johannes A. van Geffen

Follow

Person

Apeldoorn, NL

People

Patents Grantslast 30 patents

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...
Information Patent Grant
Piercing tools
- Patent number 3,939,683
- Issue date Feb 24, 1976
- Johannes Adrianus van Geffen
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...