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| Number | Title | Issue Date |
| 6868814 | Method for manufacturing a multi-part valve for internal combustion engines For making an interconnection between a valve head and stem, the interconnection between these parts is made by pouring a cast alloy around the stem end. A connection and a valve are also provided. ... | 03/22/2005 |
| 6161285 | Method for manufacturing a poppet valve from a γ-TiAl base alloy A method for the manufacture of a poppet valve made of a γ-TiAl base alloy for internal combustion engines. In this method, the γ-TiAl blank is first subjected to primary forming, for example, by extrusion, in such a manner that thereafter it has approx... | 12/19/2000 |
| 5054195 | Process for the production of a valve A process for the production of a valve, in particular a charge cycle valve of an internal-combustion engine, having a separately produced hollow valve shank with a widening shank section arranged at the valve-side end, which is connected to a valve disk ... | 10/08/1991 |
