Patents by Inventor Dwight A. Kraai

Dwight A. Kraai 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).

  • Ingot mold and method for pouring ingots
    Patent number: 4054170
    Abstract: An ingot mold of the bottle-top type and method for its use wherein the primary pipe or shrinkage cavity at the top of the ingot is decreased in length and a solid bridge is formed between the primary and secondary pipe cavities, sealing off the secondary cavity. The cast ingot is cropped in the area of the solid bridge between the primary and secondary pipe cavities, leaving the secondary cavity sealed such that it can be welded without oxidation during hot rolling to increase the ingot yield.
    Type: Grant
    Filed: June 15, 1976
    Date of Patent: October 18, 1977
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventors: Dwight A. Kraai, Clifford R. Whiddon