US3582269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ammonium gold cyanide
Assignee: Engelhard Minerals and Chemicals Corp
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Filing: 1969-07-03
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Granted: 1971-06-01
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Expires: 1989-07-03
Abstract
Abstract AN ION EXCHANGE PROCESS IS PROVIDED FOR PRODUCING AMMONIUM GOLD CYANIDE. THE PROCESS INCLUDES PROVIDING A CATION EXCHANGE RESIN IN AMMONIUM FORM, E.G. BY PASSING A SOLUTION CONTAINING AN AQUEOUS AMMONIUM SALT INTO CONTACT WITH A CATION EXCHANGE RESIN IN HYDROGEN FORM TO CONVERT THE RESIN TO THE AMMONIUM FORM, AND SUBSEQUENTLY TREATING THE CATION EXCHANGE RESIN IN AMMONIUM FORM WITH A SOLUTION CONTAINING AN ALKALI GOLD CYANIDE TO PRODUCE AMMONIUM GOLD CYANIDE.
Inventors
- 👤 Carl D Keith
- 👤 Alfred J Haley Jr
- 👤 Kenneth D Baker
- 👤 Peter Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:59
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/08; C01C3/11; B; B01; B01J; B01J39/00; B01J39/04; B01J39/05
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |