Patent US4802898A successfully refreshed from Google Patents.
US4802898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for removing cyanogen chloride from air
Assignee: WESTVACO Corp A CORP OF
•
Filing: 1985-06-17
•
Granted: 1989-02-07
•
Expires: 2005-06-17
Abstract
Abstract Cyanogen chloride is removed from air or other gases using a whetlerite type filter which omits chromium and comprises an activated carbon base impregnated with triethylenediamine and optionally copper and silver.
Inventors
- 👤 Edward D. Tolles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:44
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; A; A62; A62B; A62B23/00; B01D53/02; B01J; B01J20/00; B01J20/02; B01J20/20; Y; Y10; Y10S; Y10S95/00; Y10S95/90; Y10S95/901
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
37 words
In a method for removing cyanogen chloride from an air stream containing cyanogen chloride using a carbon containing filter, the improvement comprising said carbon having an effective amount of triethyleneamine added thereto in the absence of chromium.
Claim 2
Dependent Claim
37 words
In a method for removing cyanogen chloride from an air stream containing cyanogen chloride using a carbon containing filter, the improvement comprising said carbon having an effective amount of triethyleneamine added thereto in the absence of chromium.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said triethylenediamine is present in an amount ranging from about 1.0 to about 7.5 weight %.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein said triethylenediamine is present in an amount ranging from about 4 to about 6 weight %.
Claim 5
Independent Claim
19 words
The method of claims 1, 2 or 3 wherein said carbon further includes up to 20 weight percent copper.
Claim 6
Independent Claim
19 words
The method of claims 1, 2 or 3 wherein said carbon further includes up to 0.5 weight percent silver.
Claim 7
Independent Claim
16 words
The method of claims 1, 2 or 3 wherein said carbon further includes copper and silver.
Claim 8
Independent Claim
32 words
The method of claims 1, 2 or 3 wherein said carbon further includes from about 5 to about 20 weight percent copper and from about 0.03 to about 0.1 weight percent silver.
Claim 9
Dependent Claim
37 words
Gas mask device for removing cyanogen chloride gas from an air stream containing cyanogen chloride comprising housing means containing carbon particles impregnated with an amount of triethylene-diamine for effectively removing cyanogen chloride in the absence of chromium.
Claim 10
Dependent Claim
37 words
Gas mask device for removing cyanogen chloride gas from an air stream containing cyanogen chloride comprising housing means containing carbon particles impregnated with an amount of triethylene-diamine for effectively removing cyanogen chloride in the absence of chromium.
Claim 11
Dependent Claim
13 words
The device of claim 8 further including up to 20 weight percent copper.
Claim 12
Dependent Claim
18 words
The device of claim 9 wherein the copper content is from about 5 to about 20 weight percent.
Claim 13
Dependent Claim
13 words
The device of claim 8 further including up to 0.5 weight percent silver.
Claim 14
Dependent Claim
18 words
The device of claim 11 wherein the silver content is from about 0.03 to about 0.1 weight percent.
Claim 15
Dependent Claim
10 words
The device of claim 8 further including copper and silver.
Claim 16
Independent Claim
24 words
The device of claims 8, 9, 11, 13, 10, or 12 wherein the triethylenediamine content is from about 1.0 to about 7.5 weight percent.
Claim 17
Independent Claim
23 words
The device of claims 8, 9, 11, 13, 10, or 12, wherein the triethylenediamine content is from about 2 to 6 weight percent.
Claim 18
Dependent Claim
21 words
Type AS whetlerite charcoal impregnated with triethylenediamine in an amount effective for removing cyanogen chloride from an airstream containing cyanogen chloride.
Claim 19
Dependent Claim
21 words
Type AS whetlerite charcoal impregnated with triethylenediamine in an amount effective for removing cyanogen chloride from an airstream containing cyanogen chloride.
References Cited (Backward Citations)
US2511288A
Cited
US2920050A
Cited
US2920051A
Cited
US2818323A
Cited
FR1575501A
Cited
US3453807A
Cited
GB1123822A
Cited
US3355317A
Cited
US3739550A
Cited
US3618295A
Cited
US4111833A
Cited
US4040802A
Cited
US4204980A
Cited
US4212852A
Cited
US4293317A
Cited
US4531953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |