Kenneth F Henderson

US Patent:

54075831, Apr 18, 1995

Filed:

Jul 15, 1993

Appl. No.:

8/092171

Inventors:

Jasbir S. Gill - McKees Rocks PA
Kenneth F. Henderson - Pittsburgh PA

Assignee:

Calgon Corporation - Pittsburgh PA

International Classification:

C02F 512

US Classification:

210701

Abstract:

An anionic/cationic polymer mixture comprising: (a) a polyanion selected from polyacrylic acid, polymethacrylic acid, and polymaleic anhydride, each optionally copolymerized with each other, or optionally copolymerized with acrylamide up to a molar unit ratio of 1:1, provided that the total polyanionic weight average molecular weight is from about 1 to 5 thousand, and (b) the polycation poly(dimethyldiallylammonium chloride) having a weight average molecular weight of from about 25 thousand to 1 million, wherein the weight ratio of polyanion (a) to polycation (b) is from 1:2 to 1:8, has been found to give excellent inhibition of the formation, deposition and adherence of various alkali metal and alkaline earth metal scales, e. g. , sodium sulfate, sodium carbonate and calcium carbonate scales in the stringent conditions which characterize black liquor heaters, evaporators, etc. in paper mills, particularly in association with Kamyr and similar wood chip digesters, characterized by elevated pH's of 12 and higher, high dissolved organic and inorganic solids concentrations, and elevated temperatures and pressures.

US Patent:

52542866, Oct 19, 1993

Filed:

Dec 10, 1992

Appl. No.:

7/988544

Inventors:

Jasbir S. Gill - McKees Rocks PA
Kenneth F. Henderson - Pittsburgh PA

Assignee:

Calgon Corporation - Pittsburgh PA

International Classification:

C02F 510
C02F 100
D21C 714

US Classification:

252180

Abstract:

An anionic/cationic polymer mixture comprising: (a) a polyanion selected from polyacrylic acid, polymethacrylic acid, and polymaleic anhydride, each optionally copolymerized with each other, or optionally copolymerized with acrylamide up to a molar unit ratio of 1:1, provided that the total polyanionic weight average molecular weight is from about 1 to 5 thousand, and (b) the polycation poly(dimethyldiallylammonium chloride) having a weight average molecular weight of from about 25 thousand to 1 million, wherein the weight ratio of polyanion (a) to polycation (b) is from 1:2 to 1:8, has been found to give excellent inhibition of the formation, deposition and adherence of various alkali metal and alkaline earth metal scales, e. g. , sodium sulfate, sodium carbonate, and calcium carbonate scales in the stringent conditions which characterize black liquor heaters, evaporators, etc. in paper mills, particularly in association with Kamyr and similar wood chip digesters, characterized by elevated pH's of 12 and higher, high dissolved organic and inorganic solids concentrations, and elevated temperatures and pressures.

US Patent:

61093610, Aug 29, 2000

Filed:

Aug 23, 1999

Appl. No.:

9/379547

Inventors:

Kenneth Henderson - Compton CA

International Classification:

A62C 3700
A62C 3500
B05B 1510
B05B 306
B05B 1500

US Classification:

169 54

Abstract:

A fire protection system for the exterior of a building that provides protection from fires by sprinkling the exterior of the building with water. The fire protection system includes a number of sprinkler heads that each also include a light source for providing illumination as needed.