Patent US3443640A successfully refreshed from Google Patents.
US4110344A
Expired / Lapsed
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Adsorbent for polynuclear aromatic compounds
Assignee: United States Department of the Interior
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Filing: 1977-10-18
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Granted: 1978-08-29
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Expires: 1997-10-18
Abstract
Abstract An adsorbent composition comprising powdered charcoal on a support of polyurethane foam, and its use for separation of polynuclear aromatic compounds from mixtures containing them.
Inventors
- 👤 David L. Stalling
- 👤 James N. Huckins
- 👤 William A. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:43
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28042; B01J20/28045; B01D; B01D53/00; B01D53/02; B01J20/28054; B01J20/28095; B01J20/28097; C; C07; C07D; C07D319/00; C07D319/10; C07D319/14; C07D319/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
49 words
A process for separation of polynuclear aromatic compounds selected from the group consisting of chlorinated dibenzodioxins, chlorinated naphthalenes, chlorinated dibenzofurans, and mixtures thereof from mixtures containing said compounds comprising contacting said mixtures with an adsorbent consisting essentially of powdered charcoal coated on a support material consisting of polyurethane foam.
Claim 2
Dependent Claim
49 words
A process for separation of polynuclear aromatic compounds selected from the group consisting of chlorinated dibenzodioxins, chlorinated naphthalenes, chlorinated dibenzofurans, and mixtures thereof from mixtures containing said compounds comprising contacting said mixtures with an adsorbent consisting essentially of powdered charcoal coated on a support material consisting of polyurethane foam.
Claim 3
Dependent Claim
16 words
The process of claim 1 in which the polyurethane foam is in a finely ground form.
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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |