Patents
US 9487916 B2: Method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in papermaking
- Granted
- 2016-11-08
- Filed
- 2013-06-17 application 13919167
- Type
- Utility · 19 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
The invention provides a method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in a papermaking process The method improves the efficiency of drainage aids or wet web strength aids or wet strength aid by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a those additives. The drainage additive or wet web strength additive or wet strength aid holds the cellulose fibers together tightly and is not wasted on the filler particles.
Source: PVGPATDIS, file of 2026-04-10 (ipg161108.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 | Hubei, CN | 25 | PVGPATDIS, file of 2026-04-10 | |
| Qing Long Rao | Shanghai, CN | 9 | PVGPATDIS, file of 2026-04-10 | |
| Stephen B. Ashton | St. Charles, IL | 6 | PVGPATDIS, file of 2026-04-10 | |
| Weiguo Cheng | Naperville, IL | 38 | PVGPATDIS, file of 2026-04-10 | |
| Aleksandar Todorovic | Helsinki, FI | 4 | PVGPATDIS, file of 2026-04-10 | |
| Alan Smith | Sandbach, GB | 4 | 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 | D21H17/375 | PVGPATDIS, file of 2026-04-10 |
| D21C | Production of cellulose by removing non-cellulose substances from cellulose-containing materials; regeneration of pulping liquors; apparatus therefor | D21C3/02 | PVGPATDIS, file of 2026-04-10 |
| Y02W | Climate change mitigation technologies related to wastewater treatment or waste management | Y02W30/64 | 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 | 43133/876 | 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 | 42939/891 | ECORSEXC, file of 2026-09-25 |
| 2014-06-30 | Assignment Assignment of assignor's interest | SMITH, ALAN signed 2014-06-19 TODOROVIC, ALEKSANDAR signed 2014-06-19 ASHTON, STEPHEN signed 2014-06-20 CHENG, WEIGUO signed 2014-06-20 LI, JUN signed 2014-06-24 RAO, QING LONG signed 2014-06-27 ZHAO, YULIN signed 2014-06-27 | NALCO COMPANY NAPERVILLE, IL | 33211/505 | 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.