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US4050638A Expired / Lapsed US ⏱️ 0.0 years remaining

Radioactive matter containing waste gas treating installation

Assignee: NGK Insulators Ltd
•
Filing: 1975-04-21
•
Granted: 1977-09-27
•
Expires: 1995-04-21
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Abstract

Abstract Maintenance apparatuses for and improvements in a radioactive matter containing waste gas treating installation, which is capable of completely carrying out waste gas cleaning by means of ceramic filter element is disclosed. The installation is provided with at least one of the following three apparatuses or devices, i.e. A ceramic filter element exchange apparatus which is capable of preventing radioactive contamination caused by scattering of radioactive dust at the time of inspecting or exchanging the filter element and preventing an operator from being subjected to radiation internal exposure as well as rapidly exchanging a spent filter element for a new one by remote control; A ceramic filter element treating apparatus which can pulverize the spent filter element by mechanical power instead of human power in a short time so as to considerably reduce the spent ceramic filter element in volume and change it into a form which can easily be solidified; and A device having a sealed joint structure which is capable of securing the filter element to a support plate in a reliable and sealed manner by remote control.

Inventors

  • 👤 Isao Ito
  • 👤 Yoichi Karita

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 18:15
CPC Classifications
G; G21; G21F; G21F7/00; G21F7/06; G21F7/061; G21F9/00; G21F9/02; Y; Y10; Y10S; Y10S422/00; Y10S422/903

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 162 words
A radioactive matter containing waste gas treating installation comprising, in combination: A. a ceramic filter element exchange device including; 1. an air-tight box means with a filter element supplying box having a sight glass 2. a traveling crane means driven by a driving shaft means arranged in the upper part of the box means, and 3. a lifting means carried by the frame means for suspending a chuck for holding a filter element and raising and lowering said element, to exchange it for a new element and; B. a spent ceramic filter treatment system including; 1. a spent ceramic filter receiving chamber having an upper dimension with a bottom plate, said bottom plate openable and closeable in an air-tight manner 2. a crusher chamber, the top of which is defined by said bottom plate and including crusher means for pulverizing said filter element and, 3. a container means located closely adjacent to the bottom of the crusher means for receiving crushed pieces.
Claim 2
Dependent Claim 162 words
A radioactive matter containing waste gas treating installation comprising, in combination: A. a ceramic filter element exchange device including; 1. an air-tight box means with a filter element supplying box having a sight glass 2. a traveling crane means driven by a driving shaft means arranged in the upper part of the box means, and 3. a lifting means carried by the frame means for suspending a chuck for holding a filter element and raising and lowering said element, to exchange it for a new element and; B. a spent ceramic filter treatment system including; 1. a spent ceramic filter receiving chamber having an upper dimension with a bottom plate, said bottom plate openable and closeable in an air-tight manner 2. a crusher chamber, the top of which is defined by said bottom plate and including crusher means for pulverizing said filter element and, 3. a container means located closely adjacent to the bottom of the crusher means for receiving crushed pieces.
Claim 3
Dependent Claim 15 words
An apparatus as claimed in claim 1, wherein the box means further has glove means.
Claim 4
Dependent Claim 16 words
An apparatus as claimed in claim 1, wherein the box means further has inside illuminating means.
Claim 5
Dependent Claim 18 words
An apparatus as claimed in claim 1, wherein the box means is covered with a radiation shielding material.
Claim 6
Dependent Claim 13 words
An apparatus as claimed in claim 4, wherein the shielding material is lead.
Claim 7
Dependent Claim 15 words
An apparatus as claimed in claim 1, wherein the crusher means comprises a roll crusher.
Claim 8
Dependent Claim 18 words
An apparatus as claimed in claim 1, wherein the crusher means is covered with a radiation shielding material.
Claim 9
Dependent Claim 18 words
An apparatus as claimed in claim 1, wherein the container means is covered with a radiation shielding material.
Claim 10
Dependent Claim 24 words
An apparatus as claimed in claim 1, wherein the apparatus further comprises a glove box means provided between the installation and the crusher means.
Claim 11
Dependent Claim 16 words
An apparatus as claimed in claim 9, wherein the glove box means has an exhaust duct.
Claim 12
Dependent Claim 17 words
An apparatus as claimed in claim 9, wherein the glove box means further has a sight glass.

References Cited (Backward Citations)

US1296756A Cited
US3267830A Cited
US3482711A Cited
US3567578A Cited
US3815761A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-09-26 1981-03-28 1981-09-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-09-26 1985-03-28 1985-09-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-09-26 1989-03-28 1989-09-27 $7700.00 Window Closed / Lapsed

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