Patent US2610907A successfully refreshed from Google Patents.
US2610907A
Expired / Lapsed
US
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Process for recovery of osmium as osmium tetraoxide
Assignee: Merck and Co Inc
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Filing: 1950-08-01
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Granted: 1952-09-16
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Expires: 1970-08-01
Abstract
No abstract record available.
Inventors
- 👤 Gustav A Stein
- 👤 Henry C Vogel
- 👤 Raymond G Valerio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:23
CPC Classifications
C; C01; C01G; C01G55/00; C01G55/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE PROCESS OF PREPARING OSMIUM TETROXIDE FROM AN OSMIUM RESIDUE CONTAINING A LOWER VALENCE COMPOUND OF OSMIUM ADMIXED WITH ORGANIC MATTER WHICH COMPRISES REACTING TOGETHER SAID OSMIUM RESIDUE, CHROMIC ACID, NITRIC ACID AND SULFURIC ACID, SAID REACTION BEING CARRIED OUT BY HEATING THE REACTANTS IN AQUEOUS SOLUTION UNDER REFLUX, THEREBY PRODUCING A REACTION MIXTURE CONTAINING OSMIUM TETROXIDE, SUBJECTING THE REACTION MIXTURE TO DISTILLATION THEREBY DISTILLING AN AZEOTROPIC MIXTURTE OF WATER AND OSMIUM TETROXIDE, AND SEPARATING OSMIUM TETROXIDE FROM THE RESULTING DISTILLATE.
Claim 2
Dependent Claim
81 words
THE PROCESS OF PREPARING OSMIUM TETROXIDE FROM AN OSMIUM RESIDUE CONTAINING A LOWER VALENCE COMPOUND OF OSMIUM ADMIXED WITH ORGANIC MATTER WHICH COMPRISES REACTING TOGETHER SAID OSMIUM RESIDUE, CHROMIC ACID, NITRIC ACID AND SULFURIC ACID, SAID REACTION BEING CARRIED OUT BY HEATING THE REACTANTS IN AQUEOUS SOLUTION UNDER REFLUX, THEREBY PRODUCING A REACTION MIXTURE CONTAINING OSMIUM TETROXIDE, SUBJECTING THE REACTION MIXTURE TO DISTILLATION THEREBY DISTILLING AN AZEOTROPIC MIXTURTE OF WATER AND OSMIUM TETROXIDE, AND SEPARATING OSMIUM TETROXIDE FROM THE RESULTING DISTILLATE.
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) | 1955-09-16 | 1956-03-17 | 1956-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-16 | 1960-03-17 | 1960-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-16 | 1964-03-17 | 1964-09-16 | $7700.00 | Window Closed / Lapsed |