Method for preparing weathered coal-derived humic acid/urea-formaldehyde slow-release fertilizer granules by reactive extrusion process with depolymerization-activation-polycondensation trinity and fertilization method

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12180125
APP PUB NO 20240174578A1
SERIAL NO

18431971

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

A method for preparing a weathered coal-derived humic acid/urea-formaldehyde slow-release fertilizer granule by reactive extrusion process with depolymerization-activation-polycondensation trinity is provided. In an alkaline environment, paraformaldehyde is depolymerized into formaldehyde small molecules, which react with urea to form monohydroxymethylurea and dihydroxymethylurea. Under the strong shearing action of screws of the twin-screw reactive extruder, the macromolecular weathered coal-derived humic acid is depolymerized into relatively small molecule weathered coal-derived humic acid, and abundant active carboxyl groups are exposed, some of which immediately undergo dehydration condensation with —NH2 on the urea-formaldehyde molecule produced by the polycondensation of hydroxymethylurea during the reactive extrusion process to generate weathered coal-derived humic acid/urea-formaldehyde and its granules.

Loading the Abstract Image... loading....

First Claim

See full text

Family

Loading Family data... loading....

Patent Owner(s)

Patent OwnerAddress
NORTH UNIVERSITY OF CHINA030051 XUEYUAN ROAD SHANXI PROVINCE TAIYUAN PROVINCE NO 3 TAIYUAN CITY SHANXI PROVINCE 030051
SHANXI ZHONGBEI NEW MATERIAL TECHNOLOGY CO LTDAREA B ROOM 6318 BUILDING 182 NO 3 XUEYUAN ROAD JIANCAOPING DISTRICT TAIYUAN SHANXI 030051

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gao, Peng Taiyuan, CN 265 1442
Liu, Yaqing Taiyuan, CN 32 22
Tong, Yingfang Taiyuan, CN 2 0
Zhao, Guizhe Taiyuan, CN 28 22

Cited Art Landscape

Load Citation

Patent Citation Ranking

Forward Cite Landscape

Load Citation

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
3.5 Year Payment $1600.00 $800.00 $400.00 Jun 30, 2028
7.5 Year Payment $3600.00 $1800.00 $900.00 Jun 30, 2032
11.5 Year Payment $7400.00 $3700.00 $1850.00 Jun 30, 2036
Fee Large entity fee small entity fee micro entity fee
Surcharge - 3.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 7.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00