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US5007243A Expired / Lapsed US ⏱️ 0.0 years remaining

Vessel for making high-purity fine particles of active metals

Assignee: IHI Master Metal Ltd
•
Filing: 1989-11-21
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Granted: 1991-04-16
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Expires: 2009-11-21
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Abstract

Abstract A method of making high-purity fine particles of reactive metals, reactive especially in terms of their inclination to form hydroxides, comprises the steps of: preparing an inert gas atmosphere within which to manufacture the particles; reducing the moisture remaining in the inert gas atmosphere to an extremely low level; pulverizing the reactive metal within the moisture-free inert gas atmosphere; and collecting and sealing the product particles of reactive metal in a storage container in the same moisture-free inert gas atmosphere. The vessel for containing the inert gas atmosphere comprises: a hermetically sealable vessel capable of maintaining the inert gas atmosphere; a pair or rubber gloves for carrying out manual operations in the vessel under the inert gas atmosphere; a cryogenic cooling device attached to one wall of the vessel for condensing away the moisture remaining in the inert gas atmosphere into dew droplets; and an accumulator for equalizing the inner pressure of the vessel with the ambient atmospheric pressure.

Inventors

  • 👤 Toru Yamaguchi
  • 👤 Yukio Inazuki
  • 👤 Hideo Nakazawa

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 00:57
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/04; C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; Y; Y10; Y10S; Y10S241/00; Y10S241/14; Y10S505/00; Y10S505/825; Y10S505/888; Y10S505/894

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 80 words
Apparatus for use in manufacturing high-purity fine particles of reactive metals, comprising: a hermetically sealable vessel for containing inert gas atmosphere therein; a pair of rubber gloves for conducting operations within the vessel under the inert gas atmosphere; a cryogenic cooling device attached to one wall of the vessel so as to condense the moisture remaining in the inert gas atmosphere into dew droplets; and an accumulator for equalizing the inner pressure of the vessel with the ambient atmospheric pressure.
Claim 2
Dependent Claim 80 words
Apparatus for use in manufacturing high-purity fine particles of reactive metals, comprising: a hermetically sealable vessel for containing inert gas atmosphere therein; a pair of rubber gloves for conducting operations within the vessel under the inert gas atmosphere; a cryogenic cooling device attached to one wall of the vessel so as to condense the moisture remaining in the inert gas atmosphere into dew droplets; and an accumulator for equalizing the inner pressure of the vessel with the ambient atmospheric pressure.
Claim 3
Dependent Claim 44 words
The apparatus according to claim 1, further comprising: a door for covering each of the openings of the rubber gloves; and a pressure equalizing device for keeping the pressure inside the gloves covered with the door equal to the inner pressure of the vessel.
Claim 4
Dependent Claim 21 words
The apparatus according to claim 1, further comprising: a plurality of hermetically sealable vessels mutually connected in series with each other.
Claim 5
Dependent Claim 63 words
The apparatus according to claim 1, further comprising: a plurality of hermetically sealable vessels mutually connected in series, the vessels each being equipped with a pair of rubber gloves; doors for respectively covering the openings of the rubber gloves; and a pressure equalizing device for keeping the pressure inside the glove covered with the door equal to the inner pressure of the vessel.
Claim 6
Dependent Claim 50 words
The apparatus according to claim 1, further comprising: an inert gas inlet port formed at a bottom of the vessel for introducing the inert gas; and an exhaust nozzle provided at a top of the vessel for discharging air before and as the inert gas is introduced into the vessel.
Claim 7
Dependent Claim 20 words
The apparatus according to claim 1, further comprising a vacuum pump connected to the exhaust nozzle for evacuating the vessel.
Claim 8
Dependent Claim 23 words
The apparatus according to claim 1, further comprising an electromagnetic valve provided between the accumulator and the vessel for selectively activating the accumulator.
Claim 9
Dependent Claim 33 words
The apparatus according to claim 1, wherein the accumulator includes a backflow absorber, a glass bottle, an oil bath and a high-pressure vinyl hose extending from the backflow absorber into the oil bath.
Claim 10
Dependent Claim 21 words
The apparatus according to claim 1, further comprising an observation window for allowing an interior of the vessel to be observed.

References Cited (Backward Citations)

US4566293A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-04-15 1994-10-15 1995-04-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-04-15 1998-10-15 1999-04-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-04-15 2002-10-15 2003-04-16 $7700.00 Window Closed / Lapsed

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