US4133309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sorbent material and a respirator containing the sorbent material
Assignee: 3M Co
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Filing: 1977-05-13
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Granted: 1979-01-09
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Expires: 1997-05-13
Abstract
Abstract A complex granular material comprising manganese oxide-activated alumina is disclosed. The resulting material can be used in respirators to reduce the sulfur dioxide and HCl intake of the ambient atmosphere.
Inventors
- 👤 Gunter A. Kohler
- 👤 Leon W. Anders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:30
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; A; A62; A62B; A62B19/00; A62B19/02; B01D53/68
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
52 words
Granular sorbent material for the removal of sulfur dioxide and HCl from ambient air at room temperature comprising alumina granules having coated thereon a MnO x -Al 2 O 3 complex, said manganese being present in a valence state of from plus 2.5 to plus 3.5, x thus being 1.25 to 1.75.
Claim 2
Dependent Claim
52 words
Granular sorbent material for the removal of sulfur dioxide and HCl from ambient air at room temperature comprising alumina granules having coated thereon a MnO x -Al 2 O 3 complex, said manganese being present in a valence state of from plus 2.5 to plus 3.5, x thus being 1.25 to 1.75.
Claim 3
Dependent Claim
36 words
Granular sorbent material for the removal of sulfur dioxide and HCl from ambient air at room temperature according to claim 1 wherein said manganese comprises from about 0.5 to about 3 percent of the solid material.
Claim 4
Dependent Claim
38 words
Granular sorbent material for the removal of sulfur dioxide and HCl from ambient air at room temperature according to claim 2 wherein said alumina granules have a size range of from about 3.36 mm. to about 0.59 mm.
Claim 5
Dependent Claim
39 words
Granular sorbent material for the removal of sulfur dioxide and HCl from ambient air at room temperature according to claim 3 wherein said manganese oxide-aluminum oxide forms a solid solution on a core of Al 2 O 3 .
Claim 6
Dependent Claim
63 words
In a respirator for the filtration of SO 2 and HCl having a body including a facepiece adapted for peripherally sealing contact with at least that portion of a human head which include the nose and mouth, associated fastening means for holding said respirator in position on the head, and filter media, said filter media comprising granular sorbent material according to claim 1.
Claim 7
Dependent Claim
63 words
A respirator for the filtration of SO 2 according to claim 5 containing about 190 cc. of granular sorbent material, said respirator upon exposure to an atmosphere containing 500 parts per million of sulfur dioxide at an air flow rate of 64 liters per minute having a breakthrough time to 5 parts per million of sulfur dioxide of at least about 30 minutes.
Claim 8
Dependent Claim
60 words
A respirator for the filtration of HCl according to claim 5 containing about 190 cc. of granular sorbent material, said respirator upon exposure to an atmosphere containing 500 parts per million of HC1 at an air flow rate of 64 liters per minute having a breakthrough time to 5 parts per million of HCl of at least about 50 minutes.
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) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |