US3069232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of hafnium values
Assignee: Millennium Petrochemicals Inc
•
Filing: 1959-07-14
•
Granted: 1962-12-18
•
Expires: 1979-07-14
Abstract
No abstract record available.
Inventors
- 👤 Greenberg Harry
- 👤 Raymond A Foos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:52
CPC Classifications
C; C01; C01G; C01G27/00; C01G27/003; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/306; C22B3/34; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A METHOD FOR RECOVERING HAFNIUM VALUES FROM AN ORGANIC SOLUTION COMPRISING ABOUT 0.001 TO 0.1 MOLE PER LITER OF HAFNIUM THIOCYANATE; A WATER-IMMISCIBLE, OXYGENCONTAINING, ORGANIC SOLVENT; AND THIOCYCANIC ACID WHICH COMPRISES EXTRACTING SAID ORGANIC SOLUTION WITH AN AQUEOUS SOLUTION OF AMMONOUM SULFATE CONTAINING ABOUT 30 TO 50 WEIGHT PERCENT OF AMMONIUM SULFATE TO OBTAIN AN ORGANIC PHASE CONTAINING SAID ORGANIC SOLVENT AND A MAJOR PROPORTION OF SAID THIOCYANIC ACID AND AN AQUEOUS EXTRACT PAHSE CONTAINING AT LEAST 30 WEIGHT PERCENT OF SAID AMMONIUM SULFATE, ABOUT 5 TO 8 WEIGHT PERCENT OF SAID THIOCYANIC ACID, AND SAID HAFNIUM THIOCYANATE, THE RATIO OF AQUEOUS EXTRACTANT TO ORGANIC PHASE BEING FROM ABOUT 1:20 TO 1:5, TREATING SAID EXTRACT PHASE WITH SUFFICIENT GASEOUS AMMONIA TO AT LEAST NEIUTRALIZE SAID AQUEOUS EXTRACT PHASE AND TO COPRECIPITATE AMMONIUM SULFATE AND HAFNIUM HYDROXIDE; SEPARATING SAID COPRECIPITATE FROM THE REACTION MIXTURE; AND RECOVERING THE HAFNIUM HYDROXIDE FROM THE COPRECIPITATE.
Claim 2
Independent Claim
151 words
A METHOD FOR RECOVERING HAFNIUM VALUES FROM AN ORGANIC SOLUTION COMPRISING ABOUT 0.001 TO 0.1 MOLE PER LITER OF HAFNIUM THIOCYANATE; A WATER-IMMISCIBLE, OXYGENCONTAINING, ORGANIC SOLVENT; AND THIOCYCANIC ACID WHICH COMPRISES EXTRACTING SAID ORGANIC SOLUTION WITH AN AQUEOUS SOLUTION OF AMMONOUM SULFATE CONTAINING ABOUT 30 TO 50 WEIGHT PERCENT OF AMMONIUM SULFATE TO OBTAIN AN ORGANIC PHASE CONTAINING SAID ORGANIC SOLVENT AND A MAJOR PROPORTION OF SAID THIOCYANIC ACID AND AN AQUEOUS EXTRACT PAHSE CONTAINING AT LEAST 30 WEIGHT PERCENT OF SAID AMMONIUM SULFATE, ABOUT 5 TO 8 WEIGHT PERCENT OF SAID THIOCYANIC ACID, AND SAID HAFNIUM THIOCYANATE, THE RATIO OF AQUEOUS EXTRACTANT TO ORGANIC PHASE BEING FROM ABOUT 1:20 TO 1:5, TREATING SAID EXTRACT PHASE WITH SUFFICIENT GASEOUS AMMONIA TO AT LEAST NEIUTRALIZE SAID AQUEOUS EXTRACT PHASE AND TO COPRECIPITATE AMMONIUM SULFATE AND HAFNIUM HYDROXIDE; SEPARATING SAID COPRECIPITATE FROM THE REACTION MIXTURE; AND RECOVERING THE HAFNIUM HYDROXIDE FROM THE COPRECIPITATE.
References Cited (Backward Citations)
US2566665A
Cited
US2757081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |