Patents by Inventor Nelu Spiratos

Nelu Spiratos has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Polymeric basic aluminum silicate-sulphate
    Patent number: 5149400
    Abstract: A polynucleate aluminum hydroxy silicate-sulphate compound (PASS) having the following average composition:Al.sub.A (OH).sub.B (SO.sub.4).sub.C (SiO.sub.X).sub.D (H.sub.2 O).sub.EwhereinA is 1.0;B ranges from 0.75 to 2.0;C ranges from 0.30 to 1.12;D ranges from 0.005 to 0.1;X is greater than 2.0 but less than or equal to 4.0 such that 3=B+2C+2D (X-2);E is larger than 4 when the product is in aqueous form.The compound is useful for water treatment and other applications where an aluminum hydroxide gel system is required, but the compound is especially useful as a drainage and retention aid and size promoter for use in papermaking. The compound, in aqueous solution, has a long storage life.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: September 22, 1992
    Assignee: Handy Chemicals Ltd.
    Inventors: Dieter Haase, Nelu Spiratos, Carmel Jolicoeur
  • Polymeric basic aluminum silicate-sulphate
    Patent number: 5069893
    Abstract: A polynucleate aluminum hydroxy silicate-sulphate compound (PASS) having the following average composition:Al.sub.A (OH).sub.B (SO.sub.4).sub.C (SiO.sub.X).sub.D (H.sub.2 O).sub.EwhereinA is 1.0;B ranges from 0.75 to 2.0;C ranges from 0.30 to 1.12;D ranges from 0.005 to 0.1;X is greater than 2.0 but less than or equal to 4.0 such that 3=B+2C+2D (X-2);E is larger than 4 when the product is in aqueous form. The compound is useful for water treatment and other applications where an aluminum hydroxide gel system is required. The compound, in aqueous solution, has a long storage life.
    Type: Grant
    Filed: December 1, 1989
    Date of Patent: December 3, 1991
    Assignee: Handy Chemicals Limited
    Inventors: Dieter Haase, Nelu Spiratos, Carmel Jolicoeur
  • Polymeric basic aluminum silicate-sulphate
    Patent number: 4981675
    Abstract: A polynucleate hydroxy silicate-sulphate compound having the following average composition of the general formula:Al.sub.A (OH).sub.B (SO.sub.4).sub.C (SiO.sub.X).sub.D (H.sub.2 O).sub.EwhereinA is 1.0B ranges from 0.75 to 2.0C ranges from 0.30 to 1.12D ranges from 0.005 to 0.1X is greater than 2.0 but less or equal to 4.0 such that3=B+2C+2D(X-2)E is 1.5 to 4 when the product is in solid form; andE is larger than 4 when the product is in aqueous form.
    Type: Grant
    Filed: November 3, 1988
    Date of Patent: January 1, 1991
    Assignee: Handy Chemicals Ltd.
    Inventors: Dieter Haase, Nelu Spiratos, Carmel Jolicoeur
  • Method for producing aqueous solutions of basic poly aluminum sulphate
    Patent number: 4877597
    Abstract: The present invention relates to a process for the preparation of a poly aluminum sulphate product having the following formula:[Al.sub.A (OH).sub.B (SO.sub.4).sub.C (H.sub.2 O).sub.E ].sub.nin whichn is a positive integer;A is 1.0;B ranges from 0.75-2.0;C ranges from 0.5-1.12; andE is 1.5 to 4 when the product is in solid form; andE is larger than 4 when the product is in aqueous form, and whereinB+2C=3,said process comprising reacting an Alum solution with a suitable alkali aluminate under high shear mixing and recovering the desired product.
    Type: Grant
    Filed: October 25, 1988
    Date of Patent: October 31, 1989
    Assignee: Handy Chemicals Ltd.
    Inventors: Dieter Haase, Nelu Spiratos