1982-05-11 Assigned to HELENE CURTIS INDUSTRIES, INC. reassignment HELENE CURTIS INDUSTRIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RESEARCH-COTTRELL TECHNOLOGIES, INC.
1997-12-01 Assigned to HELENE CURTIS, INC. reassignment HELENE CURTIS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HELENE CURTIS INDUSTRIES, INC.