Patent US4500328A successfully refreshed from Google Patents.
US4500328A
Expired / Lapsed
US
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Bonded carbon or ceramic fiber composite filter vent for radioactive waste
Assignee: United States Department of Energy
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Filing: 1983-02-22
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Granted: 1985-02-19
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Expires: 2003-02-22
Abstract
Abstract Carbon bonded carbon fiber composites as well as ceramic or carbon bonded ceramic fiber composites are very useful as filters which can separate particulate matter from gas streams entraining the same. These filters have particular application to the filtering of radioactive particles, e.g., they can act as vents for containers of radioactive waste material.
Inventors
- 👤 Gilbert W. Brassell
- 👤 Ronald P. Brugger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:53
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2055; B01D39/2065; B01D39/2068; B01D39/2082; B01D39/2086; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; C04B35/488; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/6267; C04B35/6269; C04B35/71; C04B35/78; C04B35/80; C04B35/83; C04B38/00; C04B38/0067; C04B38/007; C04B38/0074; G; G21; G21F; G21F9/00; G21F9/02; B01D2239/00; B01D2239/02; B01D2239/0283; B01D2239/06; B01D2239/0604; B01D2239/064; B01D2239/12; B01D2239/1208; B01D2239/1225; B01D2239/1233; B01D2239/1241; C04B2111/00; C04B2111/00474; C04B2111/00793; C04B2111/00862; C04B2201/00; C04B2201/20; C04B2201/50; C04B2235/00; C04B2235/02; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5236; C04B2235/526; C04B2235/5264; C04B2235/60; C04B2235/602; C04B2235/6027; C04B2235/604; C04B2235/70; C04B2235/96; C04B2235/9607; Y; Y10; Y10S; Y10S55/00; Y10S55/09; Y10T; Y10T442/00; Y10T442/60; Y10T442/696
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
86 words
A closed but safely vented, walled area comprising, at least one wall defining a closed area, all walls being substantially impermeable to both gases and particulate matter, and the closed area containing radioactive particulate material, and located in a wall thereof, a filter consisting essentially of a carbon bonded carbon fiber composite, ceramic bonded ceramic fiber composite or a carbon bonded ceramic fiber composite, said filter being permeable to gaseous species and retaining radioactive particles of a diameter of 0.3 μm with an efficiency of 99.97%.
Claim 2
Dependent Claim
86 words
A closed but safely vented, walled area comprising, at least one wall defining a closed area, all walls being substantially impermeable to both gases and particulate matter, and the closed area containing radioactive particulate material, and located in a wall thereof, a filter consisting essentially of a carbon bonded carbon fiber composite, ceramic bonded ceramic fiber composite or a carbon bonded ceramic fiber composite, said filter being permeable to gaseous species and retaining radioactive particles of a diameter of 0.3 μm with an efficiency of 99.97%.
Claim 3
Dependent Claim
19 words
A vented area of claim 1 wherein the fibers in said filter composite have diameters of about 7-12 μm.
Claim 4
Dependent Claim
17 words
A vented area of claim 2 wherein the fibers in said filter have lengths of 0.01-0.03 inch.
Claim 5
Dependent Claim
34 words
A vented area of claim 3 wherein the filter composite has a density of about 0.2-0.3 g/cc, a porosity of about 90-95 vol. %, and a compressive strength of at least about 150 psi.
Claim 6
Dependent Claim
22 words
A vented area of claim 3 wherein said filter composite consists essentially of carbon bonded carbon fibers and esentially no graphite flakes.
Claim 7
Dependent Claim
33 words
A vented area of claim 5 wherein in said carbon bonded carbon fiber composite, the fibers are carbonized nylon, carbonized polyacrylonitrile or carbonized rayon and these are carbon bonded by carbonized phenolic resin.
Claim 8
Dependent Claim
24 words
A vented area of claim 1 wherein said filter composite consists essentially of carbon or ceramic bonded ceramic fibers and esentially no graphite flakes.
Claim 9
Dependent Claim
17 words
A vented area of claim 7 wherein said filter composite consists essentially of zirconia bonded zirconia fibers.
Claim 10
Dependent Claim
16 words
A container whose contents comprise radioactive material and which defines a vented area of claim 4.
Claim 11
Dependent Claim
13 words
A container of claim 9 wherein the radioactive contents comprise transuranium waste material.
Claim 12
Independent Claim
63 words
A method of safely venting a container of radioactive particulate material, comprising incorporating in a wall thereof a filter consisting essentially of a carbon bonded carbon fiber composite, a ceramic bonded ceramic fiber composite or a carbon bonded ceramic fiber composite, said filter being permeable to gaseous species and retaining radioactive particles of a diameter of 0.3 μm with an efficiency of 99.97%.
Claim 13
Independent Claim
63 words
A method of safely venting a container of radioactive particulate material, comprising incorporating in a wall thereof a filter consisting essentially of a carbon bonded carbon fiber composite, a ceramic bonded ceramic fiber composite or a carbon bonded ceramic fiber composite, said filter being permeable to gaseous species and retaining radioactive particles of a diameter of 0.3 μm with an efficiency of 99.97%.
Claim 14
Independent Claim
75 words
A method of separating radioactive particulate matter from gaseous species in which it is entrained comprising, contacting a mixture of the gaseous species and the radioactive particulate matter with a filter consisting essentially of a carbon bonded carbon fiber composite, a ceramic bonded ceramic fiber composite or a carbon bonded ceramic fiber composite, said filter being permeable to gaseous species and retaining radioactive particles of a diameter of 0.3 μm with an efficiency of 99.97%.
Claim 15
Independent Claim
75 words
A method of separating radioactive particulate matter from gaseous species in which it is entrained comprising, contacting a mixture of the gaseous species and the radioactive particulate matter with a filter consisting essentially of a carbon bonded carbon fiber composite, a ceramic bonded ceramic fiber composite or a carbon bonded ceramic fiber composite, said filter being permeable to gaseous species and retaining radioactive particles of a diameter of 0.3 μm with an efficiency of 99.97%.
Claim 16
Dependent Claim
15 words
A method of claim 12 wherein the particulate matter is derived from radioactive waste material.
Claim 17
Dependent Claim
18 words
A method of claim 12 wherein the fibers in said filter composite have diameters of about 7-12 μm.
Claim 18
Dependent Claim
16 words
A method of claim 14 wherein the fibers in said filter have lengths of 0.01-0.03 inch.
Claim 19
Dependent Claim
33 words
A method of claim 15 wherein the filter composite has a density of about 0.2-0.3 g/cc, a porosity of about 90-95 vol. %, and a compressive strength of at least about 150 psi.
Claim 20
Dependent Claim
16 words
A method of claim 16 wherein said filter composite consists essentially of carbon bonded carbon fibers.
Claim 21
Dependent Claim
31 words
A method of claim 17 wherein said carbon bonded carbon fiber composite, the fibers are carbonized nylon, carbonized polyacrylonitrile or carbonized rayon and these are carbon bonded by carbonized phenolic resin.
References Cited (Backward Citations)
US3138561A
Cited
US2821261A
Cited
US3265898A
Cited
US3535852A
Cited
US4234326A
Cited
US3944403A
Cited
US4133651A
Cited
US4157248A
Cited
US4111815A
Cited
US4160059A
Cited
US4082525A
Cited
US4264341A
Cited
US4152482A
Cited
US4314828A
Cited
US4342574A
Cited
US4391873A
Cited
US4398931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |