Patent US5731964A successfully refreshed from Google Patents.
Patent US3629144A successfully refreshed from Google Patents.
US3629144A
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US
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Heavy metal acid salt recovery using anion exchange resin
Assignee: Shell USA Inc
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Filing: 1969-08-08
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Granted: 1971-12-21
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Expires: 1989-08-08
Abstract
Abstract HEAVY METAL ACID SALT EPOXIDATION/HYDROXYLATION CATALYSTS, ARE RECOVERED IN A FORM SUITABLE FOR DIRECT RECYCLE BY CONTACT OF AN AQUEOUS SOLUTION OF SAID CATALYSTS WITH A BICARBONATE-TREATED STRONGLY BASIC ANION EXCHANGE RESIN.
Inventors
- 👤 George A Hahn
- 👤 John H La Rochelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:05
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/30; C; C07; C07D; C07D301/00; C07D301/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |