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US6162281A
Expired / Lapsed
US
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Device and process for displaying the exhaustion of a gas filter
Assignee: Draeger Safety AG and Co KGaA
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Filing: 1999-05-27
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Granted: 2000-12-19
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Expires: 2019-05-27
Abstract
Abstract A device for displaying the exhaustion of a gas filter filled with an adsorbent (3). A toxic gas detector (14) determines the toxic gas content at a sampling site (8) within the adsorbent (3). A reference sampling site (12) is located in the area of a gas inlet point (6) of the gas filter (2). The toxic gas detector is designed such that it determines the toxic gas content alternately at the sampling sites (8, 12), and the exhaustion of the filter is determined by a comparison of the toxic gas content at the sampling site (8) with the toxic gas content at the reference sampling site (12).
Inventors
- 👤 Klaus Ammann
- 👤 Wolfgang Bather
- 👤 Michael Dietrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:09
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0084; B01D46/0086; A; A62; A62B; A62B18/00; A62B18/08; A62B18/088; B01D46/0027; B01D46/0036; B01D46/42; B01D46/44; B01D46/442; G; G21; G21F; G21F9/00; G21F9/02; Y; Y10; Y10S; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
110 words
A process for determining the exhaustion of a gas filter filled with an adsorbent, the process comprising the steps of: providing a toxic gas content adsorbent sampling site within the adsorbent; providing a toxic gas content reference sampling site in an area of a filter gas inlet region; measuring a toxic gas reference concentration at said reference sampling site with a gas detector; measuring a toxic gas reference concentration at said adsorbent sampling site with the gas detector; and forming a display of the exhaustion of the filter by comparing the toxic gas content measured at said adsorbent sampling site with the toxic gas concentration at said reference sampling site.
Claim 2
Dependent Claim
110 words
A process for determining the exhaustion of a gas filter filled with an adsorbent, the process comprising the steps of: providing a toxic gas content adsorbent sampling site within the adsorbent; providing a toxic gas content reference sampling site in an area of a filter gas inlet region; measuring a toxic gas reference concentration at said reference sampling site with a gas detector; measuring a toxic gas reference concentration at said adsorbent sampling site with the gas detector; and forming a display of the exhaustion of the filter by comparing the toxic gas content measured at said adsorbent sampling site with the toxic gas concentration at said reference sampling site.
Claim 3
Dependent Claim
16 words
The process in accordance with claim 1, wherein the comparison is performed by forming the quotient.
Claim 4
Dependent Claim
103 words
A gas filter with filter exhaustion display, comprising: a gas filter filled with adsorbent and having a gas inlet region; a toxic gas detector for detecting a toxic gas content at a sampling site within the adsorbent; a reference sampling site provided in an area of said gas inlet region of said gas filter, said gas detector alternately detecting the toxic gas content at said sampling site and said reference sampling site; a display of the exhaustion of said filter formed by a comparison of the toxic gas content at said sampling site with the toxic gas content at said reference sampling site.
Claim 5
Dependent Claim
103 words
A gas filter with filter exhaustion display, comprising: a gas filter filled with adsorbent and having a gas inlet region; a toxic gas detector for detecting a toxic gas content at a sampling site within the adsorbent; a reference sampling site provided in an area of said gas inlet region of said gas filter, said gas detector alternately detecting the toxic gas content at said sampling site and said reference sampling site; a display of the exhaustion of said filter formed by a comparison of the toxic gas content at said sampling site with the toxic gas content at said reference sampling site.
Claim 6
Dependent Claim
69 words
The device in accordance with claim 3, further comprising additional sampling sites provided at locations extending in a direction of flow through said gas filter, said display of the exhaustion of said filter being formed by comparing the toxic gas contents of at least some one of said sampling site and one or more of said additional sampling sites with the toxic gas content at said reference sampling site.
Claim 7
Dependent Claim
27 words
The device in accordance with claim 4, wherein at least some of said sampling sites within said adsorbent are located at equally spaced locations from one another.
Claim 8
Dependent Claim
18 words
The device in accordance with claim 3, wherein the comparing to form said display includes forming a quotient.
Claim 9
Dependent Claim
20 words
The device in accordance with claim 3 further comprising exhaust means connected to said sampling sites for exhaustive gas sampling.
Claim 10
Dependent Claim
20 words
The device in accordance with claim 7, further comprising a toxic gas photoionization detector (PID) connected to said sampling sites.
Claim 11
Dependent Claim
140 words
A gas filter and filter exhaustion display system, comprising: a gas filter filled with adsorbent and having a gas inlet region; a first sampling site within the adsorbent; a second sampling site within the adsorbent; a reference sampling site provided in an area of said gas inlet region of said gas filter; a toxic gas detector for detecting a toxic gas content, said gas detector alternately detecting a toxic gas content at one or both of said first sampling site and said second sampling site, and said gas detector detecting a toxic gas content at said reference sampling site; a display of the exhaustion of said filter formed by a comparison of the toxic gas content at one or both of said first sampling site and said second sampling site with the toxic gas content at said reference sampling site.
Claim 12
Dependent Claim
140 words
A gas filter and filter exhaustion display system, comprising: a gas filter filled with adsorbent and having a gas inlet region; a first sampling site within the adsorbent; a second sampling site within the adsorbent; a reference sampling site provided in an area of said gas inlet region of said gas filter; a toxic gas detector for detecting a toxic gas content, said gas detector alternately detecting a toxic gas content at one or both of said first sampling site and said second sampling site, and said gas detector detecting a toxic gas content at said reference sampling site; a display of the exhaustion of said filter formed by a comparison of the toxic gas content at one or both of said first sampling site and said second sampling site with the toxic gas content at said reference sampling site.
Claim 13
Dependent Claim
71 words
The device in accordance with claim 9, further comprising additional sampling sites provided at locations extending in a direction of flow through said gas filter, said display of the exhaustion of said filter being formed by comparing the toxic gas contents of at least one of said first and second sampling sites and one or more of said additional sampling sites with the toxic gas content at said reference sampling site.
Claim 14
Dependent Claim
27 words
The device in accordance with claim 10, wherein at least some of said sampling sites within said adsorbent are located at equally spaced locations from one another.
Claim 15
Dependent Claim
18 words
The device in accordance with claim 9, wherein the comparing to form said display includes forming a quotient.
Claim 16
Dependent Claim
20 words
The device in accordance with claim 9, further comprising exhaust means connected to said sampling sites for exhaustive gas sampling.
Claim 17
Dependent Claim
20 words
The device in accordance with claim 13, further comprising a toxic gas photoionization detector (PID) connected to said sampling sites.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-12-19 | 2004-06-19 | 2004-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-12-19 | 2008-06-19 | 2008-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-12-19 | 2012-06-19 | 2012-12-19 | $7700.00 | Window Closed / Lapsed |