US4981650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treatment of dioxin-contaminated media
Assignee: OBG TECHNICAL SERVICES 1304 BUCKLEY ROAD SYRACUSE NY
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Filing: 1987-08-26
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Granted: 1991-01-01
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Expires: 2007-08-26
Abstract
Abstract Methods for treating toxic chlorinated dibenzo-p-dioxin-contaminated media by photolytic degradation are disclosed. Soil contaminated wiht such toxins are contacted with a photolysis-activating agent such as 1-hexadecylpyridinium chloride and irradiated with UV radiation in the presence of one or more hydrogen donors.
Inventors
- 👤 Terry L. Brown
- 👤 Orest Hrycyk
- 👤 Cornelius B. Murphy, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:40
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/10; A62D3/17; A62D3/176; A61; A61L; A61L2/00; A61L2/02; A61L2/08; A61L2/10; B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/123; B09; B09C; B09C1/00; B09C1/08; A62D2101/00; A62D2101/20; A62D2101/22; A62D2101/28; A62D2203/00; A62D2203/10; Y; Y10; Y10S; Y10S260/00; Y10S260/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A method of decontaminating a toxic chlorinated dipenzo-p-contaminated soil media comprising contacting said media with 1-hexadecylpyridinium chloride and irradiating said resulting media with ultraviolet radiation in the presence of one or more hydrogen donors, the intensity and duration of said irradiation and the amount of said hydrogen donors being effective to degrade substantially all of said toxic dioxin in said media.
Claim 2
Independent Claim
61 words
A method of decontaminating a toxic chlorinated dipenzo-p-contaminated soil media comprising contacting said media with 1-hexadecylpyridinium chloride and irradiating said resulting media with ultraviolet radiation in the presence of one or more hydrogen donors, the intensity and duration of said irradiation and the amount of said hydrogen donors being effective to degrade substantially all of said toxic dioxin in said media.
Claim 3
Dependent Claim
11 words
The method of claim 1 where said dioxin is 2,3,7,8 tetrachlorodibenzo-p-dioxin.
Claim 4
Independent Claim
81 words
A method of decontaminating a toxic chlorinated dibenzo-p-dioxin-contaminated soil media comprising contacting said media with a liquid medium in which said toxic dioxin is soluble to form a toxic dioxin-containing extract, contacting said extract with 1-hexadecylpyridinium chloride and irradiating the resulting extract with ultraviolet radiation in the presence of one or more hydrogen donors, the intensity and duration of said irradiation and the amount of said hydrogen donors being effective to degrade substantially all of said toxic dioxin in said extract.
Claim 5
Independent Claim
81 words
A method of decontaminating a toxic chlorinated dibenzo-p-dioxin-contaminated soil media comprising contacting said media with a liquid medium in which said toxic dioxin is soluble to form a toxic dioxin-containing extract, contacting said extract with 1-hexadecylpyridinium chloride and irradiating the resulting extract with ultraviolet radiation in the presence of one or more hydrogen donors, the intensity and duration of said irradiation and the amount of said hydrogen donors being effective to degrade substantially all of said toxic dioxin in said extract.
Claim 6
Dependent Claim
10 words
The method of claim 3 where said dioxin is 2,3,7,8-tetrachlorodibenzo-p-dioxin.
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) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |