Patents
US 9506202 B2: Furnish pretreatment to improve paper strength aid performance in papermaking
- Granted
- 2016-11-29
- Filed
- 2014-11-10 application 14537055
- Type
- Utility · 7 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
The invention is directed towards methods, compositions, and apparatus for increasing the strength of paper made out of a furnish having a large proportion of OCC. The method involves the following steps: 1) Providing a paper furnish having a large amount of OCC in it, 2) adding strength promoter to the furnish prior to adding a strength agent to the furnish, 3) adding a strength agent to the furnish, and 4) making a paper product from the furnish. This method allows cheap OCC material to be used in a papermaking process without the quality problems that the anionic trash in OCC typically causes. Thus paper products having low costs and high quality can be produced.
Source: PVGPATDIS, file of 2026-04-10 (ipg161129.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 |
|---|---|---|---|---|
| Yulin Zhao | Shanghai, CN | 16 | PVGPATDIS, file of 2026-04-10 | |
| Jun Li | Shanghai, CN | 25 | PVGPATDIS, file of 2026-04-10 | |
| Qing Long Rao | Shanghai, CN | 1 | PVGPATDIS, file of 2026-04-10 | |
| Weiguo Cheng | Naperville, IL | 38 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| D21H | Pulp compositions; preparation thereof not covered by subclasses d21c or d21d; impregnating or coating of paper; treatment of finished paper not covered by class b31 or subclass d21g; paper not otherwise provided for | D21H21/20 | 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 |
|---|---|---|---|---|---|
| 2017-07-28 | Assignment Assignment of assignor's interest | NALCO COMPANY LLC signed 2017-02-27 | ECOLAB USA INC. ST. PAUL, MN | 43133/837 | ECORSEXC, file of 2026-09-25 |
| 2017-06-21 | Name change Change of name | NALCO COMPANY signed 2015-12-21 | NALCO COMPANY LLC WILMINGTON, DE | 42939/948 | ECORSEXC, file of 2026-09-25 |
| 2014-11-10 | Assignment Assignment of assignor's interest | CHENG, WEIGUO signed 2011-12-14 LI, JUN signed 2011-12-14 LONG RAO, QING signed 2011-12-14 ZHAO, YULIN signed 2011-12-14 | NALCO COMPANY NAPERVILLE, IL | 34195/13 | 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.