§
Luxuse
Patent Intelligence
Sign In
Patent EP0154342A2 successfully refreshed from Google Patents.
← Back to Patent Explorer
EP0154342A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for producing highly pure glass preform for optical fiber

Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1985-03-07
•
Granted: —
•
Expires: 2005-03-07
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A method for producing a glass preform for an optical fiber by an outside vapor-phase depostion method, which comprises forming fine glass particles by jetting gaseous glass raw material and fuel gas from a first burner to deposit the particles on a seed rod to form a soot rod at such a temperature that a specific bulk density of the soot rod being formed is low and subsequently heating the soot rod by a second burner so as to increase the bulk density of the soot and then sintering the soot rod to obtain a transparent glass preform for an optical fiber, by which method, a highly pure glass preform is produced in a good deposition yield without cracking.

Inventors

  • 👤 Gotaro C/O Yokohama Works Of Sumitomo Tanaka
  • 👤 Hiroo C/O Yokohama Works Of Sumitomo Kanamori
  • 👤 Futoshi C/O Yokohama Works Of Sumitomo Mizutani

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 23:06
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/10; C03B37/12; C03B37/01; C03B37/012; C03B37/014; C03B37/01413; C03B37/0142; C03B37/01446; C03B2207/00; C03B2207/04; C03B2207/06; C03B2207/20; C03B2207/22; C03B2207/50; C03B2207/52; C03B2207/54; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 102 words
A method for producing a glass preform for an optical fiber by an outside vapor-phase depostion method, which comprises forming fine glass particles by jetting gaseous glass raw material and fuel gas from a first burner- to deposit the particles on a seed rod to form a soot rod at such a temperature that a specific bulk density of the soot rod being formed is low and subsequently heating the soot rod by a second burner so as to increase the bulk density of the soot and then sintering the soot rod to obtain a transparent glass preform for an optical fiber.
Claim 2
Independent Claim 102 words
A method for producing a glass preform for an optical fiber by an outside vapor-phase depostion method, which comprises forming fine glass particles by jetting gaseous glass raw material and fuel gas from a first burner- to deposit the particles on a seed rod to form a soot rod at such a temperature that a specific bulk density of the soot rod being formed is low and subsequently heating the soot rod by a second burner so as to increase the bulk density of the soot and then sintering the soot rod to obtain a transparent glass preform for an optical fiber.
Claim 3
Dependent Claim 30 words
A method according to claim 1, wherein the specific bulk density of the soot before heating is from 0.02 to 0.1 and that after heating is from 0.15 to 0.5.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag