Patents
US 9683935 B2: Method to measure surfactant in fluid
- Granted
- 2017-06-20
- Filed
- 2012-06-18 application 13525395
- Type
- Utility · 18 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
The invention is directed towards methods and compositions for identifying the presence of surfactants in water. The invention is quite superior over the prior art because it can form a colorful complex in half the time, avoid the need for difficult separation steps, use a safer solvent, and avoid the formation of messy foam. The invention involves adding to the water a cobalt thiocyanate reagent, pre-prepared from a cobalt salt and a thiocyanate salt, which forms a colorful complex with the surfactant. Chloroform is then added to the water. The cobalt reagent causes the virtually all of the surfactant to form a colored complex which rapidly migrates into the chloroform and prevents the surfactant from foaming. Once in the chloroform, a UV-vis spectrometer can easily and precisely identify the type and amount of surfactant that was in the water.
Source: PVGPATDIS, file of 2026-04-10 (ipg170620.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| Nalco Company LLC 271 patents | US company or organization | Naperville, IL | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Viviane Pacheco e Silva | São Paulo, BR | 1 | PVGPATDIS, file of 2026-04-10 | |
| Luiz Wanderley Bratfisch Pace | São Paulo, BR | 5 | PVGPATDIS, file of 2026-04-10 | |
| Edmir Carone, Jr. | São Paulo, BR | 1 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| G01N | Investigating or analysing materials by determining their chemical or physical properties | G01N21/59 | PVGPATDIS, file of 2026-04-10 |
| Y10T | Technical subjects covered by former us classification | Y10T436/173845 | 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 |
|---|---|---|---|---|---|
| 2017-06-14 | Name change Change of name | NALCO COMPANY signed 2015-12-21 | NALCO COMPANY LLC WILMINGTON, DE | 42808/524 | ECORSEXC, file of 2026-09-25 |
| 2017-06-14 | Assignment Assignment of assignor's interest | NALCO COMPANY LLC signed 2017-02-27 | ECOLAB USA INC. ST. PAUL, MN | 42706/473 | ECORSEXC, file of 2026-09-25 |
| 2012-06-18 | Assignment Assignment of assignor's interest | BRATFISCH PACE, LUIZ WANDERLEY signed 2012-06-11 CARONE, EDMIR, JR. signed 2012-06-11 PACHECO E SILVA, VIVIANE signed 2012-06-11 | NALCO COMPANY NAPERVILLE, IL | 28389/727 | 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.