Henry Christian Cheung

US Patent:

56657838, Sep 9, 1997

Filed:

Feb 8, 1996

Appl. No.:

8/598462

Inventors:

Arthur Katzakian - Elk Grove CA
Henry Cheung - Livermore CA
Charles E. Grix - Sacramento CA
Donald C. McGehee - Carmichael CA

Assignee:

Ecotech - Rancho Cordova CA

International Classification:

C08F 0842

US Classification:

521 26

Abstract:

A composition for regenerating spent weak cation exchange resin and a method of utilization including salts of. alpha. -hydroxy carboxylic acids or o-hydroxy benzoic acids. The following steps are employed in cyclically regenerating polycarboxylic acid cation exchange resins: (a) utilizing a charged or alkali metal salt of polycarboxylate acid cation resin to soften water; (b) regenerating the spent resin in one step with an active regenerant of the. alpha. -hydroxy carboxylic acids or o-hydroxy benzoic acids to produce spent regenerant; (c) precipitating the polyvalent hard ions in the spent regenerant with sodium or potassium carbonate to reform the active regenerant; (d) separating the precipitate; and (e) concentrating the dilute active regenerate solution to its approximate initial concentration and recovering of water for process rinses.

US Patent:

58473157, Dec 8, 1998

Filed:

Nov 29, 1996

Appl. No.:

8/758431

Inventors:

Arthur Katzakian - Elk Grove CA
Henry Cheung - Livermore CA
Charles E. Grix - Sacramento CA
Donald C. McGehee - Carmichael CA

Assignee:

Ecotech - Rancho Cordova CA

International Classification:

C06B 4510

US Classification:

149 1991

Abstract:

An ignitable solid gas generating composition comprises a polyalkylammonium binder, usually polyvinylamine nitrate or polyethyleneimmonium nitrate, an oxidizer mixture comprising ammonium nitrate and a first additive which produces an eutectic melt which is liquid at a temperature well below the melting point of the ammonium nitrate as well as that of the first additive, and an additional quantity of the ammonium nitrate and a second additive. Further, combustion modifier additives may be added to the composition.