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:
Oct. 22, 1991
Filed:
Sep. 12, 1989
Applicant:
Inventors:
Assignee:
Schott Glaswerke, Mainz, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C / ; B05D / ; B05D / ;
U.S. Cl.
CPC ...
65-312 ; 427 39 ; 427 38 ; 427166 ; 427237 ; 427238 ; 427 531 ; 65-311 ; 65 182 ;
Abstract
For producing a fiberoptic waveguide preforms by plasma pulse-induced chemical vapor deposition (PICVD), blank glass tubes are prepared having a continuously increasing internal diameter in the direction of gas flow. This type of blank compensates for the otherwise occurring decrease in the density of the layer-forming molecules due to pressure drop, thereby permitting the formation of a uniform masswise deposition of layer-forming molecules along the length of the tube. This permits the production of collapsed preforms having a series of coating layers of substantially uniform thickness.