Patent US4957522A successfully refreshed from Google Patents.
US4957522A
Expired / Lapsed
US
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Combination of a filter and a material permeable to gases but impermeable to liquids
Assignee: Individual
•
Filing: 1989-06-06
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Granted: 1990-09-18
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Expires: 2009-06-06
Abstract
Abstract Performance of filters is improved by covering a surface thereof with a material which is permeable to gas but impermeable to liquids, e.g., Gortex®.
Inventors
- 👤 Gilbert W. Brassell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:14
CPC Classifications
G; G21; G21F; G21F5/00; G21F5/06; G21F5/12; B; B01; B01D; B01D39/00; B01D39/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
In combination with a container for containing radioactive material, wherein the container vents gases to the atmosphere through an opening in the wall of the container, a filter element comprised of an activated carbon or carbon-carbon composite disposed in the opening of the container with a first surface facing into the container and a second surface interfacing the atmosphere to which the container vents for filtering out radioactive material from vent gases passing from the container, through the filter element and to the atmosphere; a layer of material completely covering the second surface of the filter element, the material being impermeable to liquid and permeable to vapor thereby allowing filtered vapor to vent from the container while preventing liquid water from entering the container through the filter element.
Claim 2
Dependent Claim
128 words
In combination with a container for containing radioactive material, wherein the container vents gases to the atmosphere through an opening in the wall of the container, a filter element comprised of an activated carbon or carbon-carbon composite disposed in the opening of the container with a first surface facing into the container and a second surface interfacing the atmosphere to which the container vents for filtering out radioactive material from vent gases passing from the container, through the filter element and to the atmosphere; a layer of material completely covering the second surface of the filter element, the material being impermeable to liquid and permeable to vapor thereby allowing filtered vapor to vent from the container while preventing liquid water from entering the container through the filter element.
Claim 3
Dependent Claim
12 words
A combination of claim 1, wherein said material is in sheet form.
Claim 4
Dependent Claim
14 words
A combination of claim 1, wherein said material is Gortex® or an equivalent material.
Claim 5
Dependent Claim
15 words
A combination of claim 1, wherein said container is a drum or a plastic bag.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |