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. 07, 1989
Filed:
Jul. 16, 1987
Applicant:
Inventors:
Anca Gutu-Nelle, Stuttgart, DE;
Armin Baumgartner, Ludwigsburg, DE;
Assignee:
Alcatel NV, Amsterdam, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B / ; C03B / ;
U.S. Cl.
CPC ...
65-2 ; 65 181 ; 65900 ; 65 321 ; 264120 ; 264500 ;
Abstract
A method of making optical waveguides is disclosed in which, to fabricate a preform, glass forming pulverulent material is filled into a mold by means of one or more screw conveyors. The quantity of glass forming pulverulent material filled into the mold per unit of time is increased by passing a suitable gas through the apparatus. Thus, the quantity conveyed per unit of time can also be controlled by adjusting the gas pressure. By using a dry gas, the moisture content of the powder can be reduced.