# US 11,999,669 B1 · Nitrogen activator stabilizer for reducing and protecting nitrogen fertilizer

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- Number: US 11,999,669 B1
- Document ID: US11999669B1
- Status: Granted
- Kind: B1
- Application number: 18/411,369
- Filed: 2024-01-12
- Granted: 2024-06-04
- Earliest claimed: 2023-05-08
- Assignees: King Faisal University
- Applicants: King Faisal University
- Inventors: Hossam El-Din Saad El-Beltagi; Khaled Mohamed Amen Ramadan; Hani Saber Sayed Saudy; Sameh Ahmed Rizk
- Web page: https://patentgrep.com/patent/US11999669B1

## CPC

- C05G 3/44: {for affecting solubility}
- A01C 21/00: Methods of fertilising {, sowing or planting}
- C05B 7/00: Fertilisers based essentially on alkali or ammonium orthophosphates (C05B11/00 takes precedence)
- C05C 9/005: {Post-treatment}
- C05G 1/00: Mixtures of fertilisers belonging individually to different subclasses of C05
- C05G 3/90: for affecting the nitrification of ammonium compounds or urea in the soil
- C05G 5/18: Semi-solid fertilisers, e.g. foams or gels
- C05G 5/38: {layered or coated with wax or resins}
- C07D 473/18: one oxygen and one nitrogen atom, e.g. guanine
- C07D 473/30: attached in position 6, e.g. hypoxanthine
- C07D 473/34: attached in position 6, e.g. adenine
- C05G: MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS (organic fertilisers containing added bacterial cultures, mycelia, or the like C05F11/08; organic fertilisers containing plant vitamins or hormones C05F11/10); FERTILISERS CHARACTERISED BY THEIR FORM
- A01C: PLANTING; SOWING; FERTILISING (parts, details or accessories of agricultural machines or implements, in general A01B51/00 - A01B75/00)
- C05B: PHOSPHATIC FERTILISERS
- C05C: NITROGENOUS FERTILISERS
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

A nitrogen activator additive to stabilize nitrogen fertilizer, where the activator is coated onto the nitrogen fertilizer, is provided. The nitrogen activator additive contains the novel compound ABT-PNB, a potassium compound, and chitosan, and provides controlled release of the nitrogen fertilizer which fertilizes crops using reduced levels of the nitrogen fertilizer and reduces the release of greenhouse gasses. Urea is an exemplary nitrogen fertilizer that can be used in this regard.

## Claims

### Claim 1

2-(1-(4-(dimethylamino)butyl)-8-((2-ethoxy-2-oxoethyl)thio)-6-oxo-6,9-dihydro-1H-purin-2-yl)-6-nitrobenzoic acid (ABT-PNB), having the following structure: