Inventor

John W. Sparapany

Inventor

Bolingbrook, IL, US

Overview

15→

Patents

1989–2003

Patent span

Chemistry

Primary field (CPC C)

Patents· 15 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

C02Fprimary

C02FTreatment of water, waste water, sewage, or sludge32%

C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds32%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests15%

A23LFoods, foodstuffs or non-alcoholic beverages, not otherwise provided for3%

B01JChemical or physical processes, e.g. catalysis or colloid chemistry3%

C07FAcyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur, selenium or tellurium3%

C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds3%

C09KMaterials for miscellaneous applications, not provided for elsewhere3%

C13BProduction of sucrose3%

G01NInvestigating or analysing materials by determining their chemical or physical properties3%

PatentTitleYear

6,517,677'Method of improving retention and drainage in a papermaking process using low molecular weight cationic dispersion polymers'2003 6,413,433'Method for dewatering of sludge'2002 6,398,967'Method of clarifying water using low molecular weight cationic dispersion polymers'2002 6,238,486'Detectable cationic flocculant and method of using same in industrial food processes'2001 5,938,937'Hydrophilic dispersion polymers for treating wastewater'1999 5,346,627'Method for removing metals from a fluid stream'1994 5,338,816'Hydrophobic polyelectrolytes used in removing color'1994 5,283,306'Hydrophobic polyelectrolytes used in removing color'1994 5,179,173'Aminoalkylphosphinates and phosphinic acid-containing polymers therefrom'1993 5,164,095'Dithiocarbamate polymers'1992 5,143,622'Phosphinic acid-containing polymers and their use in preventing scale and corrosion'1992 5,137,641'Cationic polymers for sludge dewatering'1992 5,093,413'Cationic polymers for sludge dewatering'1992 4,921,904'Superabsorbent polymers'1990 4,868,248'Polyhydroxyamic acid polymers from polyacrylic acids'1989

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1989–2002Patents assigned to NALCO CHEMICAL CO (14)· patent assignee history

1989–2003Based in Bolingbrook, IL, US· patent location history

2003Patents assigned to ONDEO NALCO CO (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
NALCO CHEMICAL CO	14	1989–2002
ONDEO NALCO CO	1	2003

Locations

Location	Patents	Span
Bolingbrook, Illinois, US	15	1989–2003