The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 1997
Filed:
Apr. 17, 1995
Applicant:
Inventors:
Young D Kim, deceased, late of Dublin, OH (US);
A Leonard Haugse, Dublin, OH (US);
Assignee:
Ashland Inc., Columbus, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22C / ;
U.S. Cl.
CPC ...
523141 ; 523144 ; 524563 ; 528249 ; 526270 ;
Abstract
This invention relates to nitrogen free heat cured foundry mixes essentially free of free formaldehyde comprising (a) a nitrogen free modified furan resin, (b) furfuryl alcohol, (c) polyvinyl acetate, preferably(d) a tar selected from the group consisting of resorcinol pitch, bisphenol A tar, and (e) a latent acid curing catalyst. The foundry mixes are used to prepare foundry shapes. They are cured in the presence of the latent acid curing catalyst by heating at an elevated temperature.