US4287038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of chlorophenolic derived compounds
Assignee: Pullman Standard Inc
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Filing: 1980-05-08
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Granted: 1981-09-01
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Expires: 2000-05-08
Abstract
Abstract Chlorophenolic derived compounds which may be used as herbicides and which contain a contaminant comprising 2,3,7,8-tetrachlorodibenzo-p-dioxin may be purified by subjecting a solution of the compound dissolved in a protic solvent to the emission from a light source having a wave length of from about 180 to about 350 nanometers, such as a laser beam, whereby the contaminant will be decomposed.
Inventors
- 👤 Edward M. Geiser
- 👤 Russell W. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:56
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/10; A62D3/17; A62D3/176; B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/121; C; C07; C07C; C07C37/00; C07C37/68; C07C37/86; C07C51/00; C07C51/42; C07C51/487; A62D2101/00; A62D2101/20; A62D2101/22; A62D2101/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
57 words
A process for the removal of a contaminant comprising 2,3,-7,8-tetrachlorodibenzo-p-dioxin from a chlorophenolic derived compound which comprises subjecting a solution of said compound dissolved in a protic solvent to the emission from a light source having a wave length in the range of from about 180 to about 350 nanometers, and recovering the purified chlorophenolic derived compound.
Claim 2
Dependent Claim
57 words
A process for the removal of a contaminant comprising 2,3,-7,8-tetrachlorodibenzo-p-dioxin from a chlorophenolic derived compound which comprises subjecting a solution of said compound dissolved in a protic solvent to the emission from a light source having a wave length in the range of from about 180 to about 350 nanometers, and recovering the purified chlorophenolic derived compound.
Claim 3
Dependent Claim
23 words
The process as set forth in claim 1 in which the removal of said contaminant is effected at ambient temperatures and atmospheric pressures.
Claim 4
Dependent Claim
17 words
The process as set forth in claim 1 in which said light source comprises a laser beam.
Claim 5
Dependent Claim
17 words
The process as set forth in claim 1 in which said chlorophenolic derived compound is 2,4,5-trichlorophenoxyacetic acid.
Claim 6
Dependent Claim
17 words
The process as set forth in claim 1 in which said chlorophenolic derived compound is 2,4-dichlorophenoxyacetic acid.
Claim 7
Dependent Claim
17 words
The process as set forth in claim 1 in which said chlorophenolic derived compound is 4-chloro-2-methylphenoxyacetic acid.
Claim 8
Dependent Claim
16 words
The process as set forth in claim 1 in which said chlorophenolic derived compound is pentachlorophenol.
Claim 9
Dependent Claim
17 words
The process as set forth in claim 1 in which said chlorophenolic derived compound is 2-(2,4,5-trichlorophenoxy)propionic acid.
Claim 10
Dependent Claim
16 words
The process as set forth in claim 1 in which the protic solvent comprises methyl alcohol.
Claim 11
Dependent Claim
16 words
The process as set forth in claim 1 in which the protic solvent comprises ethyl alcohol.
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |