Alfred W Oberhofer

47707909, Sep 13, 1988

Jun 5, 1984

6/617152

Alfred W. Oberhofer - Downers Grove IL

Nalco Chemical Company - Naperville IL

B01J 4900

210673

Described are processes for improving and maintaining the performance of particulate and othe types of water-treatment solids, especially particulate ion exchange resins, filter media, and adsorbents which have become fouled with organic contaminants, micro-organisms, and wasteproducts thereof.

39591662, May 25, 1976

Dec 16, 1974

5/533355

Alfred W. Oberhofer - Downers Grove IL
James J. Benko - Griffith IN
Joseph C. Drozd - Park Ridge IL

Nalco Chemical Company - Oak Brook IL

C11D 732
C09K 1500

252146

A cleaner to be used preferably in conjunction with conventional glycol-type collants in automotive cooling systems and methods of using same. The present cleaners may be referred to as extended-life cleaners which may be added to the glycol coolant and are co-extensive with the life of said glycol. These cleaners operate to dissolve deposits, minimize corrosion damage, and dissolve organic degradation products, all of which cause heat transfer difficulties. The basic cleaner comprises: A. an aminopolycarboxylic acid B. an. alpha. hydroxy acid such as gluconic, tartaric, or citric C. an azole copper protector such as mercaptobenzothiazole (MBT) and a monoaryl triazole such as benzotriazole or tolyltriazole Wherein the above components are combined in a weight ratio ranging from 3:1:1 to 2:1:1. An aqueous concentrate is preferred and in such a concentrate the amount of Deposit Release Agent varies from about 85-15% with a more preferred range being an aqueous concentrate which contains from 50-15% by weight of the Deposit Release Agent. The balance of such concentrate is, of course, water, preferably soft water.

RE300667, Aug 7, 1979

May 27, 1977

5/801075

Alfred W. Oberhofer - Downers Grove IL

Nalco Chemical Company - Oak Brook IL

C02B 162

210 30R

Removal of chromate ions from water containing a large amount of total dissolved solids by contacting the water with an acidified weakly basic anion exchange resin, preferably in. [. microporous. ]. . Iadd. macroporous. Iaddend. form, to selectively remove chromates from the water.

46577858, Apr 14, 1987

Dec 11, 1985

6/807639

John A. Kelly - Woodridge IL
David A. Grattan - LaGrange Highlands IL
Alfred W. Oberhofer - Downers Grove IL

Nalco Chemical Company - Oak Brook IL

C04B 902
C23C 1600
C23F 1104

4272556

The use of benzo and/or tolyltriazole alone or in combination with neutralizing and filming amines to reduce copper corrosion in boiler condensate systems by feeding the mixture into the main steamheaders.

39621090, Jun 8, 1976

Dec 16, 1974

5/533356

Alfred W. Oberhofer - Downers Grove IL
James J. Benko - Griffith IN
Joseph C. Drozd - Park Ridge IL

Nalco Chemical Company - Oak Brook IL

C02B 500

252146

A cleaner-inhibitor and method of incorporating same into an automotive or diesel coolant system consisting of 2-4 fluid ounces per gallon of a cleaner whose basic components are: A. an aminopolycarboxylic acid B. an. alpha. hydroxy acid such as gluconic, tartaric, or citric C. an azole copper protector such as mercaptobenzothiazole (MBT) and a monoaryl triazole such as benzotriazole or tolyltriazole Wherein the ratio of A:B:C is about 3:1:1 to 2:1:1. A, b, and C above constitute a Deposit Release Agent in the cleaner. The cleaner above is combined with an inhibitor which is a multi-component inhibiting composition of the boron-nitrite type containing an alkali metal silicate and which may include a copper inhibitor and a polymeric dispersant, which is a water-soluble carboxylic acid polymer such as styrene maleic anhydride copolymer, a polyacrylate or methacrylate copolymer or carboxymethyl cellulose. The cleaner-inhibitor is adjusted with caustic to give a pH in the range 7. 5-12. 6 and preferably 7. 5-10.