Patents Examined by Seidel Ricahrd K.
  • Method for improving stength of gasifiable patterns
    Patent number: 4736786
    Abstract: A core assembly is formed by molding a destructible plastic form in abutting relation to a rigid bonded core. The core assembly can be used for casting large or long and thin castings. The rigid bonded core reinforces the plastic form against flexural and torsional forces as well as forces within the plastic tending to change the dimensional configuration of the plastic form.
    Type: Grant
    Filed: December 31, 1985
    Date of Patent: April 12, 1988
    Assignee: Deere & Company
    Inventors: David V. Trumbauer, Larry L. Fosbinder, Terry L. Erion