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:
Feb. 29, 2000
Filed:
Jun. 30, 1998
Oleg Y Abramov, St. Petersburg, RU;
Stanislav A Koltchanov, St. Petersburg, RU;
Leila V Laisheva, St. Petersburg, RU;
LightPath Technologies, Inc., Albuquerque, NM (US);
Abstract
Gradient refractive index elements are fabricated from the melt, using two or more molten glass compositions, to prevent bubble formation in the elements. The individual glass compositions are melted in separate containers, and then added as appropriate to a single crucible. The more dense glasses settle to the bottom of the crucible, while the less dense glasses float on top of the melt layer. As a consequence of using molten glass, no bubbles appear. Batching of the process can be done by the level of the free melt surface, which means that one can control the batched volume of the melted glass by controlling the level of the free melt surface in the crucible.