Patent US2899272A successfully refreshed from Google Patents.
US2899272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of persulfates
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
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Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:43
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/055; C01B15/06; C01B15/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN THE PRODUCTION OF A METAL PERSULFATE FROM THE GROUP CONSISTING OF THE PERSULFATES OF SODIUM, POTASSIUM, BARIUM, LITHIUM, STRONTIUM, RUBIDIUM AND CESIUM, BY REACTION IN AN AQUEOUS SOLUTION OF AMMONIUM PERSULFATE AND A HYDROXIDE OF SAID METAL, THE IMPROVEMENT WHICH COMPRISES MIXING SAID AMMONIUM PERSULFATE AND SAID HYDROXIDE TOGETHER IN SUBSTANTIALLY STOICHIOMETRIC PROPORTIONS, AT A TEMPERATURE OF ABOUT 0* TO 45*C. AND AT A PRESSURE ABOUT 5 TO 90 MM. OF MERCURY ABSOLUTE, WHEREBY SAID AMMONIUM PERSULFATE AND SAID HYDROXIDE ARE CAUSED TO REACT TO FORM A REACTION MIXTURE CONTAINING AMMONIA, WATER AND SAID METAL PERSULFATE, AND SAID METAL PERSULFATE IS CRYSTALLIZED OUT FROM SAID REACTION MIXTURE AS A SOLID, AND SAID AMMONIA AND WATER ARE REMOVED FROM THE REACTION MIXTURE AS VAPORS.
Claim 2
Dependent Claim
124 words
IN THE PRODUCTION OF A METAL PERSULFATE FROM THE GROUP CONSISTING OF THE PERSULFATES OF SODIUM, POTASSIUM, BARIUM, LITHIUM, STRONTIUM, RUBIDIUM AND CESIUM, BY REACTION IN AN AQUEOUS SOLUTION OF AMMONIUM PERSULFATE AND A HYDROXIDE OF SAID METAL, THE IMPROVEMENT WHICH COMPRISES MIXING SAID AMMONIUM PERSULFATE AND SAID HYDROXIDE TOGETHER IN SUBSTANTIALLY STOICHIOMETRIC PROPORTIONS, AT A TEMPERATURE OF ABOUT 0* TO 45*C. AND AT A PRESSURE ABOUT 5 TO 90 MM. OF MERCURY ABSOLUTE, WHEREBY SAID AMMONIUM PERSULFATE AND SAID HYDROXIDE ARE CAUSED TO REACT TO FORM A REACTION MIXTURE CONTAINING AMMONIA, WATER AND SAID METAL PERSULFATE, AND SAID METAL PERSULFATE IS CRYSTALLIZED OUT FROM SAID REACTION MIXTURE AS A SOLID, AND SAID AMMONIA AND WATER ARE REMOVED FROM THE REACTION MIXTURE AS VAPORS.
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) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |