Kenneth E Goetz

US Patent:

49835505, Jan 8, 1991

Filed:

Aug 24, 1988

Appl. No.:

7/236042

Inventors:

Kenneth E. Goetz - Maplewood NJ
James A. Hagarman - Audubon PA
Joseph P. Giovene - Belleville NJ

Assignee:

Potters Industries, Inc. - Hasbrouck Heights NJ

International Classification:

C03C 1200

US Classification:

501 33

Abstract:

Hollow glass spheres having average densities of approximately 0. 10 grams/cc to approximately 2. 0 grams/cc are prepared by heating solid glass particles. The glass spheres consist essentially of the following ingredients in the following amounts state as weight percentages: SiO. sub. 2 (50 to 57%); R. sub. 2 O(2 to 15%); B. sub. 2 O. sub. 3 (0 to 20%); S(0. 05 to 1. 5%); RO(2 to 25%); RO. sub. 2 (other than SiO. sub. 2) (0 to 5%); R. sub. 2 O. sub. 3 (other than B. sub. 2 O. sub. 3) (0 to 10%); R. sub. 2 O. sub. 5 (0 to 5%); and F(0 to 5%). R represents a metal or an element like phosphorous which combines with oxygen in glass. The sizes of the hollow glass spheres are selected to produce a maximum average strength for a desired average density.

US Patent:

52179281, Jun 8, 1993

Filed:

Jan 4, 1991

Appl. No.:

7/637619

Inventors:

Kenneth E. Goetz - Maplewood NJ
James A. Hagarman - Audubon PA
Joseph P. Giovene - Belleville NJ

Assignee:

Potters Industries, Inc. - Parsippany NJ

International Classification:

C03C 1200

US Classification:

501 33

Abstract:

Hollow glass spheres having average densities of approximately 0. 10 grams/cc to approximately 2. 0 grams/cc are prepared by heating solid glass particles. The glass spheres consist essentially of the following ingredients in the following amounts stated as weight percentages: SiO. sub. 2 (50 to 57%); R. sub. 2 0(2 to 15%); B. sub. 2 O. sub. 3 (0 to 20%); S(0. 05 to 1. 5%); RO(2 to 25%); RO. sub. 2 (other than SiO. sub. 2) (0 to 5%); R. sub. 2 O. sub. 3 (other than B. sub. 2 O. sub. 3) (0 to 10%); R. sub. 2 O. sub. 5 (0 to 5%); and F(0 to 5%). R represents a metal or an element like phosphorous which combines with oxygen in glass. The sizes of the hollow glass spheres are selected to produce a maximum average strength for a desired average density.