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:
Apr. 11, 2006
Filed:
Jul. 16, 2002
Applicants:
Lorenzo Costa, Sommo, IT;
Fulvio Costa, Sommo, IT;
Matteo Crepaldi, Romentino, IT;
Inventors:
Assignee:
Degussa Novara Technology S.p.A., Novara, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B 37/16 (2006.01); C03B 8/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
Sol-gel process for the production of optical fiber preforms or overcladdings by preparing a sol, gelling the sol, drying the wet gel to a dry porous gel and densifying the dry gel to fully dense glass, wherein during the calcination treatment from 350° C. to 900° C. to remove organic impurities in the dry gel, it is carried out at least one reduced-pressure phase at a pressure comprised between about 0.01 and 0.5 bar.