Patents by Inventor Niels W. Rasmussen

Niels W. Rasmussen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Crushed and graded magnetite ore for manufacturing moulds and cores
    Patent number: 5865236
    Abstract: Crushed and graded magnetite ore is mixed with clay to form foundry moulds and cores. These moulds or cores are useful when casting non-ferrous metals or alloys, especially light metals and light-metal alloys.
    Type: Grant
    Filed: April 11, 1997
    Date of Patent: February 2, 1999
    Assignee: Georg Fischer Disa A/S
    Inventors: Preben Nordgaard Hansen, Niels W. Rasmussen, Emil Jespersen
  • String mould plant including arrangement for preventing shrinkage voids in metal castings
    Patent number: 5836373
    Abstract: In a string of molds (32) with vertical parting surfaces, each mold cavity (35) is connected through a wide throat with its own after-feeding reservoir (36). When the mold has been poured, a gas pressure is applied through a channel (43) and a passage (41) to a lower metal surface in the after-feeding reservoir (36). This gas pressure is not allowed to exceed the metallostatic pressure in the mold at the surface, at which the pressure is applied, until the metal in the ingate (37) has solidified or the ingate has been blocked in some other way. At the location where the passage (41) opens into the after-feeding reservoir, it is covered by an element (42) that is impermeable to the metal having been poured but permeable to the pressurized gas. When the metal in the ingate (37) has solidified or the ingate has been blocked in some other way, the gas pressure may be increased.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: November 17, 1998
    Assignee: Georg Fischer Disa A/S
    Inventors: Preben N. Hansen, Steen Pedersen, Niels W. Rasmussen, Vagn Mogensen, Emil Jespersen