Patent US2789033A successfully refreshed from Google Patents.
US2789033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of heavy metal ferrocyanides for the recovery of heavy metal sulfides
Assignee: Wyeth Holdings LLC
•
Filing: 1954-12-14
•
Granted: 1957-04-16
•
Expires: 1974-12-14
Abstract
No abstract record available.
Inventors
- 👤 George O Pruett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:37
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/08; C01C3/12; C01G; C01G53/00; C01G53/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A PROCESS FOR TREATING A HEAVY METAL FERROCYANIDE FOR THE RECOVERY OF A HEAVY METAL SULFIDE COMPRISING THE STEPS OF: SUSPENDING IN WATER A HEAVY METAL FERROCYANIDE; ADDING THERETO AN INORGANIC SULFIDE SELECTED FROM THE CLASS CONSISTING OF HYDROGEN SULFIDE, ALKALI METAL SULFIDE AND ALKALINE EARTH METAL SULFIDE, WHILE AGITATING THE MIXTURE AT A PH OF AT LEAST 9 TO FORM A REACTAION MIXTURE; PRECIPITATING RESULTANT METAL SULFIDE; AND SEPARATING HEAVY METAL SULFIDE FROM SAID MIXTURE.
Claim 2
Dependent Claim
76 words
A PROCESS FOR TREATING A HEAVY METAL FERROCYANIDE FOR THE RECOVERY OF A HEAVY METAL SULFIDE COMPRISING THE STEPS OF: SUSPENDING IN WATER A HEAVY METAL FERROCYANIDE; ADDING THERETO AN INORGANIC SULFIDE SELECTED FROM THE CLASS CONSISTING OF HYDROGEN SULFIDE, ALKALI METAL SULFIDE AND ALKALINE EARTH METAL SULFIDE, WHILE AGITATING THE MIXTURE AT A PH OF AT LEAST 9 TO FORM A REACTAION MIXTURE; PRECIPITATING RESULTANT METAL SULFIDE; AND SEPARATING HEAVY METAL SULFIDE FROM SAID MIXTURE.
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) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |