The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 10, 1998
Filed:
Mar. 13, 1995
Gordon J Roberts, Parma, OH (US);
John J Maloney, Solon, OH (US);
Sivasubraman K Muralidhar, North Royalton, OH (US);
Ferro Corporation, Cleveland, OH (US);
Abstract
This invention relates to a lead-free glass enamel for glass beverage containers and a method of decorating glass beverage containers using such glass enamel. The method includes the steps of: i) providing a glass beverage container; ii) providing a decorative lead-free glass enamel comprising a glass frit, the glass frit comprising in weight percent from 17% to 28% SiO.sub.2, from 12% to 30% B.sub.2 O.sub.3, up to 3% Al.sub.2 O.sub.3, up to 13% Na.sub.2 O, up to 13% K.sub.2 O, up to 14% TiO.sub.2, from 5% to 30% ZnO, up to 14% ZrO.sub.2, up to 6% CeO, up to 6% Y.sub.2 O.sub.3, from 1% to 8% La.sub.2 O.sub.3, up to 1% MgO, up to 5% CaO, up to 10% SrO, up to 16% BaO, from 0.5% to 5% fluoride, a maximum of 5% each of WO.sub.3, P.sub.2 O.sub.5, Bi.sub.2 O.sub.3, Sb.sub.2 O.sub.3 and MoO.sub.3, with the provisions that the sum of the levels of plus Na.sub.2 O plus K.sub.2 O is in the range of 6% to 13%, that the sum of the levels of MgO plus CaO plus SrO plus BaO is in the range of 1% to 16%, and that the sum of the levels of ZrO.sub.2 plus TiO.sub.2 plus La.sub.2 O.sub.3 plus CeO.sub.2 plus Y.sub.2 O.sub.3 is in the range of 7% to 25%; iii) applying the glass enamel to at least a portion of the surface of the glass beverage container; and iv) firing the glass beverage container at a temperature of from about 560.degree. C. to about 640.degree. C. so as to produce a resilient decorative coating on the surface of the beverage container.