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:
May. 20, 1980
Filed:
Sep. 13, 1978
Applicant:
Inventors:
Tore Elstrom, deceased, late of Porsgrunn, NO;
Per F Gustavsen, Skien, NO;
Olav Kjohl, Porsgrunn, NO;
Assignee:
Norsk Hydro a.s., Oslo, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528259 ;
Abstract
A method for the production of urea of high mechanical strength by the crystallizing process or the evaporation process, including a prilling or granulating step, utilizing 0.01-1% by weight of formaldehyde in the form of a formaldehyde polymer, which comprises, before prilling or granulating, incorporating in the urea, a formaldehyde polymer with a formaldehyde content of 82-97% and with a melting point of about 90.degree.-160.degree. C.