IP Library › Granted Patent US 7,905,386
Granted Patent B2
US 7,905,386 · App. 12/884,702 · Granted Mar 15, 2011

Method for airtightly joining reinforced platinum hollow tube with platinum flange

View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 7,905,386
App. No.
12/884,702
Granted
Mar 15, 2011
Kind
B2
Abstract

The present invention provides a new method for airtightly joining a hollow tube made of a reinforced platinum and a flange made of platinum or a platinum alloy, which prevents decreasing of mechanical strength of the hollow tube made of a reinforced platinum due to its joining with a flange. A method for airtightly joining a hollow tube made of a reinforced platinum with a flange made of platinum or a platinum alloy, which is a method for airtightly joining the outer periphery of a hollow tube made of a reinforced platinum produced by dispersing metal oxides in platinum or a platinum alloy, with a flange made of platinum or a platinum alloy, the method comprising a step of shrink-fitting a ring made of platinum or a platinum alloy to the outer periphery of the hollow tube, a step of heating the hollow tube to which the ring is shrink-fit at from 1,150 to 1,450° C. for from 1 to 10 hours, and a step of welding the flange made of platinum or a platinum alloy to the outer periphery of the ring.

Claims (6)

1. A flanged hollow tube produced by using a method for airtightly joining a hollow tube made of a reinforced platinum with a flange made of non-reinforced platinum or non-reinforced platinum alloy, which is a method for airtightly joining the outer periphery of a hollow tube made of a reinforced platinum produced by dispersing metal oxides in platinum or a platinum alloy, with a flange made of non-reinforced platinum or a non-reinforced platinum alloy, the method comprising:

shrink-fitting a ring made of non-reinforced platinum or a non-reinforced platinum alloy to the outer periphery of the hollow tube;

heating the hollow tube to which the ring is shrink-fit at from 1,150 to 1,450° C. for from 1 to 10 hours; and

welding the flange made of non-reinforced platinum or a non-reinforced platinum alloy to the outer periphery of the ring.

2. The flanged hollow tube according to claim 1 , which is used for a suction port for molten glass in an uprising pipe and/or a downfalling pipe of a vacuum degassing apparatus.

3. A vacuum degassing apparatus comprising the flange hollow tube as defined in claim 1 .

Assignments (1)
CHANGE OF NAME Recorded Aug 7, 2018
From: ASAHI GLASS COMPANY, LIMITED
To: AGC INC.
Reel/Frame 046730/0786 →