Patent US2871093A successfully refreshed from Google Patents.
US2871093A
Expired / Lapsed
US
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Method of recovering thiocyanate solutions
Assignee: Wyeth Holdings LLC
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Filing: 1955-08-25
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Granted: 1959-01-27
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Expires: 1975-08-25
Abstract
No abstract record available.
Inventors
- 👤 Thomas R Blanchard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:30
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
THE METHOD OF OBTAINING A CONCENTRATED AQUEOUS SOLUTION OF AN ALKLI-METAL THIOCYANATE FROM A DILUTE AQUEOUS SOLUTION CONTAINING FROM ABOUT 2% TO ABOUT 10% BY WEIGHT OF THE SAID THIOCYANATE AND HAVING A PH OF LESS THAN 7.0, SAID METHOD COMPRISING ADDING TO THE SAID DILUTE SOLUTION, AS THE SOLE CHEMICAL ADDITIVE, A SUBSTANCE WHICH ,IS ALKALINE IN THE SAID AQUEOUS SOLUTION, THE AMOUNT THEREOF BEING SUFFICIENT TO INCREASE THE PH OF THE SAID DILUTEE SOLUTION TO AT LEAST 7.5 AND CONCENTRATING THE RESULTING SOLUTION BY EVAPORATION TO AN AQUEOUS SOLUTION HAVING A CONCENTRATION OF THE SAID ALKALI-METAL THIOCYANATE SUCH THAT THE SAID SOLUTION WILL DISSOLVE A POLYMER OF ACRYLONITRILE
Claim 2
Independent Claim
110 words
THE METHOD OF OBTAINING A CONCENTRATED AQUEOUS SOLUTION OF AN ALKLI-METAL THIOCYANATE FROM A DILUTE AQUEOUS SOLUTION CONTAINING FROM ABOUT 2% TO ABOUT 10% BY WEIGHT OF THE SAID THIOCYANATE AND HAVING A PH OF LESS THAN 7.0, SAID METHOD COMPRISING ADDING TO THE SAID DILUTE SOLUTION, AS THE SOLE CHEMICAL ADDITIVE, A SUBSTANCE WHICH ,IS ALKALINE IN THE SAID AQUEOUS SOLUTION, THE AMOUNT THEREOF BEING SUFFICIENT TO INCREASE THE PH OF THE SAID DILUTEE SOLUTION TO AT LEAST 7.5 AND CONCENTRATING THE RESULTING SOLUTION BY EVAPORATION TO AN AQUEOUS SOLUTION HAVING A CONCENTRATION OF THE SAID ALKALI-METAL THIOCYANATE SUCH THAT THE SAID SOLUTION WILL DISSOLVE A POLYMER OF ACRYLONITRILE
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) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |