Patents
US 11999668 B2: Double drum systems and processes for converting biosolids to fertilizer
- Granted
- 2024-06-04
- Filed
- 2021-04-02 application 17220994
- Type
- Utility · 11 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A system for converting biosolids to fertilizer comprising: a storage tank for holding biosolids; a conveyor operably connected to the storage tank for conveying the biosolids from the storage tank to a pressurized screener, wherein the pressurized screener selectively eliminates unwanted debris from the biosolids; a second conveyor operably connected to the pressurized screener to convey the biosolids to a centrifuge, the centrifuge operatively configured to remove water from the biosolids; a third conveyor operably connected to the centrifuge to convey the biosolids to a feeding chamber, a self-leveling conveyer position in the feeding chamber configured to deliver the biosolids to a nip feeder operatively positioned in the feeding chamber to selectively biosolids from the feeding chamber to a nip, wherein the nip is a gap between a first and second dryer drums; the first and second dryer drums operatively positioned to rotate and draw biosolids from the nip feeder into the nip, wherein a first and second scrapers are operably positioned to remove biosolids from the first and second dryer drums as they rotate, wherein the first and second dryer drums are selectively heated with steam provided by a boiler; a fourth conveyor positioned underneath the dryer drums to collect the biosolids after they pass through the nip and to convey the biosolids to a pelletizer configured to form the biosolids into pellets; a fifth conveyor operably connected to the pelletizer to convey the pellets to a cooling chamber.
Source: PVGPATDIS, file of 2026-04-10 (ipg240604.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| Terry Merrell 1 patents | US individual | Kokomo, IN | PVGPATDIS, file of 2026-04-10 | |
| Merrell Bros., Inc. 4 patents | US company or organization | Kokomo, IN | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Terry Merrell | Kokomo, IN | 6 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| C05F | Organic fertilisers not covered by subclasses c05b, c05c, e.g. fertilisers from waste or refuse | C05F3/04 | PVGPATDIS, file of 2026-04-10 |
| B01D | Separation | B01D1/225 | PVGPATDIS, file of 2026-04-10 |
| C02F | Treatment of water, waste water, sewage, or sludge | C02F1/38 | PVGPATDIS, file of 2026-04-10 |
| Y02A | Technologies for adaptation to climate change | Y02A40/20 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2025-12-08 | Other License | MB HOLDING COMPANY, INC. signed 2025-12-01 | MERRELL BROS., INC. KOKOMO, IN | 73142/344 | PASDL, file of 2026-10-15 |
| 2024-06-17 | Assignment Assignment of assignor's interest | MERRELL, TERRY signed 2024-06-10 MERRELL BROS., INC. signed 2024-06-10 | MB HOLDING COMPANY, INC. KOKOMO, IN | 67743/682 | PASDL, file of 2026-10-15 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.