A method for producing ferrous sulphate and phosphoric acid
US-2026070788-A1 · Mar 12, 2026 · US
Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C05F7/00 |
| Official title | Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses |
| Display label | Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses |
| Total patents | 55 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 3 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 6 |
| 2020 | 3 |
| 2021 | 5 |
| 2022 | 5 |
| 2023 | 8 |
| 2024 | 11 |
| 2025 | 4 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Water and energy recovery system
US-12552695-B2 · Feb 17, 2026 · US
Treatment method for full resource recovery from sludge in municipal wastewater treatment plants
US-2026042692-A1 · Feb 12, 2026 · US
Sludge-derived plant biostimulant, and directional preparation method and application thereof
US-2025340495-A1 · Nov 6, 2025 · US
Waste treatment system and waste treatment method
US-12459018-B2 · Nov 4, 2025 · US
Method for improving alkaline soil and enhancing carbon capture using sludge stabilization product
US-2025084312-A1 · Mar 13, 2025 · US
Method for Nitrogen Removal and Nitrogen Salts Recovery Using Carboxylated Cellulose Extracted by Nitro-oxidation
US-2025019264-A1 · Jan 16, 2025 · US
Method of sludge pretreatment for improved digestibility and reduced scaling
US-2024425400-A1 · Dec 26, 2024 · US
Engineered calcium alginate and uses thereof
US-12145128-B2 · Nov 19, 2024 · US
Method for nitrogen removal and nitrogen salts recovery using carboxylated cellulose extracted by nitro-oxidation
US-12122687-B2 · Oct 22, 2024 · US
Process for Controlled Adsorption and Desorption of Phosphate From Liquids Using Phosphate-Selective Proteins
US-2024327248-A1 · Oct 3, 2024 · US
Method for the manufacture of a composite material for the recovery of nutrients and/or pollutants from wastewater, composite material obtained and related use
US-2024261756-A1 · Aug 8, 2024 · US
Process for controlled adsorption and desorption of phosphate from liquids using phosphate-selective proteins
US-12037265-B2 · Jul 16, 2024 · US
Method for sludge dewatering using kitchen waste to synergistically enhance anaerobic biological acidification and low-temperature thermal hydrolysis of excess sludge
US-12006271-B2 · Jun 11, 2024 · US
Enhanced nitrogen and phosphate fertilizer recovery by ferric chloride from sewage sludge and corn stover
US-11970426-B1 · Apr 30, 2024 · US
System and method for recovering nutrients from a high nitrogenous liquid waste
US-2024083791-A1 · Mar 14, 2024 · US
Waste treatment system and waste treatment method
US-2024058850-A1 · Feb 22, 2024 · US
Biomass conversion reactors and associated systems and methods
US-11866670-B2 · Jan 9, 2024 · US
Waste treatment system and waste treatment method
US-11839909-B2 · Dec 12, 2023 · US
Apparatus and Methods for Nitrogen Reduction in Wastewater
US-2023365444-A1 · Nov 16, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C05F7/00?
- CPC C05F7/00 is the Cooperative Patent Classification code for “Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses.”
- How many patents are filed under CPC C05F7/00 (Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses)?
- Our database includes 55 publications tagged with this CPC code.
- Is patent activity under CPC C05F7/00 growing?
- Publication counts under this code: 11 in 2024 vs 4 in 2025 (latest complete years).