US2876065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing pure ammonium perrhenate and other rhenium compounds
Assignee: Kennecott Corp
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Filing: 1955-04-11
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Granted: 1959-03-03
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Expires: 1975-04-11
Abstract
No abstract record available.
Inventors
- 👤 Stuart R Zimmerley
- 👤 John D Prater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:26
CPC Classifications
C; C01; C01G; C01G47/00; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS FOR THE PRODUCTION OF EXCEPTIONALLY HIGH PURITY AMMONIUM PERRHENATE FROM A CONTAMINATED RHENIUM-BEARING SOLUTION, THE POTASSIUM CONTENT OF SAID PERRHENATE BEING EXCEPTIONALLY LOW AND SINSIGNIFICANT TO RHENIUM METAL PRODUCED FROM THE PERRHENATE, SAID PROCESS COMPRISING ADSORBING RHENIUM IONS FROM SAID CONTAMINATED SOLUTION BY AN ANIONIC EXCHANGE MATERIAL; ELUTING SAID MATERIAL WITH SODIUM HYDROXIDE FOR THE REMOVAL OF CONTAMINATING ANIONS; THEREAFTER, ELUTING SAID MATERIAL WITH A WEAK SOLUTION OF A STRONG AND HIGHLY IONIZED ACID FOR THE REMOVAL OF THE RHENIUM IONS; PRECIPITATING THE RHENIUM AS A SULFIDE FROM THE RESULTING RHENIUMBEARING ELUATE SOLUTION BY INTRODUCING INTO SAID SOLUTION A RHENIUM-SULFIDE-FORMING PRECIPITANT OF HIGH PURITY, DECOMPOSING THE RHENIUM SULDIDE IN A SOLUTION OF AMMONIUM HYDROXIDE AND AN OXIDIZING AGENT TO PROVIDE A SOLU-
Claim 2
Dependent Claim
124 words
A PROCESS FOR THE PRODUCTION OF EXCEPTIONALLY HIGH PURITY AMMONIUM PERRHENATE FROM A CONTAMINATED RHENIUM-BEARING SOLUTION, THE POTASSIUM CONTENT OF SAID PERRHENATE BEING EXCEPTIONALLY LOW AND SINSIGNIFICANT TO RHENIUM METAL PRODUCED FROM THE PERRHENATE, SAID PROCESS COMPRISING ADSORBING RHENIUM IONS FROM SAID CONTAMINATED SOLUTION BY AN ANIONIC EXCHANGE MATERIAL; ELUTING SAID MATERIAL WITH SODIUM HYDROXIDE FOR THE REMOVAL OF CONTAMINATING ANIONS; THEREAFTER, ELUTING SAID MATERIAL WITH A WEAK SOLUTION OF A STRONG AND HIGHLY IONIZED ACID FOR THE REMOVAL OF THE RHENIUM IONS; PRECIPITATING THE RHENIUM AS A SULFIDE FROM THE RESULTING RHENIUMBEARING ELUATE SOLUTION BY INTRODUCING INTO SAID SOLUTION A RHENIUM-SULFIDE-FORMING PRECIPITANT OF HIGH PURITY, DECOMPOSING THE RHENIUM SULDIDE IN A SOLUTION OF AMMONIUM HYDROXIDE AND AN OXIDIZING AGENT TO PROVIDE A SOLU-
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) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |