Patents
US 7686079 B2: Method for removing silica from evaporator concentrate
- Granted
- 2010-03-30
- Filed
- 2008-08-18 application 12193432
- Type
- Utility · 30 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A method for removing silica from evaporator concentrate to facilitate disposal of the concentrate. An alkaline earth compound is mixed with the concentrate in a crystallizer. Silica in the concentrate reacts with the alkaline earth compound and precipitates from the concentrate as alkaline silicate complexes. The concentrate having the alkaline earth silicate complexes is directed to a separator where the alkaline earth silicate complexes are separated from the concentrate, producing an aqueous solution and slurry. The slurry is directed to a filter where solids are separated from a filtrate. Both the aqueous solution and the filtrate can be disposed of by deep well injection.
Source: PVGPATDIS, file of 2026-04-10 (ipg100330.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| HPD, LLC 8 patents | US company or organization | Plainfield, IL | HPD, LLC State business registration EXACT high confidence: identical full name and state | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| David E. Gamache | Oswego, IL | 7 | PVGPATDIS, file of 2026-04-10 | |
| Charles Edward Mackey | Joliet, IL | 1 | PVGPATDIS, file of 2026-04-10 | |
| Mark D. Patterson | Aurora, IL | 3 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| E21B | Earth or rock drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells | E21B43/24 | PVGPATDIS, file of 2026-04-10 |
| C02F | Treatment of water, waste water, sewage, or sludge | C02F1/04 | 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 |
|---|---|---|---|---|---|
| 2015-01-27 | Name change Change of name | VEOLIA WATER SOLUTIONS & TECHNOLOGIES NORTH AMERICA, INC. signed 2014-12-19 | VEOLIA WATER TECHNOLOGIES, INC. MOON TOWNSHIP, PA | 34817/538 | ECORSEXC, file of 2026-09-25 |
| 2013-01-10 | Assignment Assignment of assignor's interest | HPD, LLC signed 2012-12-28 | VEOLIA WATER SOLUTIONS & TECHNOLOGIES NORTH AMERICA, INC. MOON TOWNSHIP, PA | 29601/496 | ECORSEXC, file of 2026-09-25 |
| 2008-08-18 | Assignment Assignment of assignor's interest | MACKEY, CHARLES EDWARD signed 2008-08-14 PATTERSON, MARK D. signed 2008-08-14 GAMACHE, DAVID E. signed 2008-08-15 | HPD, LLC PLAINFIELD, IL | 21403/851 | ECORSEXC, file of 2026-09-25 |
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.