Helmut Landgraf

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Rumeln-Kaldenhausen, DT

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Patents Grantslast 30 patents

Information Patent Grant
Process for the continuous hardening of tubes
- Patent number 4,046,603
- Issue date Sep 6, 1977
- Mannesmann Aktiengesellschaft
- Helmut Landgraf
- C21 - METALLURGY OF IRON
Information Patent Grant
Wrapping of pipes or tubes
- Patent number 3,972,761
- Issue date Aug 3, 1976
- Mannesmann Aktiengesellschaft
- Helmut Landgraf
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method for making a thermoplastic sleeve to be used as coupler fitt...
- Patent number 3,969,170
- Issue date Jul 13, 1976
- Mannesmann Aktiengesellschaft
- Helmut Landgraf
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Quench-hardening of pipes
- Patent number 3,958,796
- Issue date May 25, 1976
- Mannesmannrohren-Werke AG
- Helmut Weidner
- C21 - METALLURGY OF IRON
Information Patent Grant
Welding of thermoplastics through resistance heating
- Patent number 3,954,541
- Issue date May 4, 1976
- Mannesmann A.G.
- Helmut Landgraf
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Apparatus for feeding and distributing steel melts
- Patent number 3,931,850
- Issue date Jan 13, 1976
- Mannesmann Aktiengesellschaft
- Helmut Landgraf
- B22 - CASTING POWDER METALLURGY