Patent US3274104A successfully refreshed from Google Patents.
US3274104A
Expired / Lapsed
US
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Solvent extraction process
Assignee: Dow Chemical Co
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Filing: 1963-05-01
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Granted: 1966-09-20
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Expires: 1983-05-01
Abstract
No abstract record available.
Inventors
- 👤 Charles E Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:23
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; B01D11/0288
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
40 words
A METHOD WHICH COMPRISES PASSING AN AQUEOUS STREAM CONTAINING ORGANIC POLLUTANTS THROUGH A BED OF ACTIVATED CHARCOAL TO LOAD THE BED WITH ADSORBED ORGANIC POLLUTANTS AND THEREAFTER ELUTING THE WET CHARCOAL BED WITH A SOLVENT ADMIXTURE OF ONE PART OF
References Cited (Backward Citations)
US1982828A
Cited
US2128931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |