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:
Dec. 02, 2025
Filed:
Jun. 16, 2022
North University of China, Taiyuan, CN;
Shanxi Zhongbei New Material Technology Co., Ltd., Taiyuan, CN;
Guizhe Zhao, Taiyuan, CN;
Mingshan Gong, Taiyuan, CN;
Yaqing Liu, Taiyuan, CN;
Yang Xiang, Taiyuan, CN;
NORTHEN UNIVERSITY OF CHINA, Taiyuan, CN;
SHANXI ZHONGBEI NEW MATERIAL TECHNOLOGY CO., LTD., Taiyuan, CN;
Abstract
This disclosure relates to slow- and controlled-release fertilizers, and more particularly to a device and a method for industrialized continuous and simplified preparing a urea-formaldehyde slow-release nitrogen fertilizer or a urea-formaldehyde-based slow- and controlled-release multi-nutrient fertilizer. Hydroxymethylurea is produced through the reaction extrusion of urea and formaldehyde. Through the self-ploycondensation of the hydroxymethylurea or the co-polymerization of the hydroxymethylurea and a modifier in a reactive extruder, the urea-formaldehyde slow-release nitrogen fertilizer or the urea-formaldehyde-based slow- and controlled-release multi-nutrient fertilizer is prepared.