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:
Aug. 26, 2025
Filed:
Mar. 28, 2023
Draka Comteq B.v., Delft, NL;
Igor Milicevic, Helmond, NL;
Mattheus Jacobus Nicolaas Van Stralen, Tilburg, NL;
Gertjan Krabshuis, Sint Oedenrode, NL;
Antonius Henricus Elisabeth Breuls, Urmond, NL;
Draka Comteq B.V., Delft, NL;
Abstract
A method for manufacturing a primary preform for optical fibers via an internal plasma chemical vapor deposition (PCVD) process in a hollow silica substrate tube having a supply side and a discharge side includes depositing doped or non-doped silica layers on the inner surface of the hollow substrate tube by supplying glass-forming gasses to the interior of the hollow substrate tube via the supply side thereof, and by creating a plasma reaction zone in the interior of the hollow substrate tube via microwave radiation having a microwave power, wherein the microwave power is decreased during the depositing.