Patent US2659659A successfully refreshed from Google Patents.
US2659659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammonium sulfate production
Assignee: Standard Oil Development Co
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Filing: 1950-12-07
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Granted: 1953-11-17
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Expires: 1970-12-07
Abstract
No abstract record available.
Inventors
- 👤 Albert J Shmidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:12
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/24; C01C1/242; C05; C05C; C05C3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A METHOD FOR PRODUCING AMMONIUM SULFATE FROM SULFURIC ACID SLUDGE CONTAINING DISSOLVED CARBON COMPOUNDS WHICH COMPRISES INTRODUCING SAID SULFURIC ACID SLUDGE INTO A BODY OF ANHYDROUS LIQUID AMMONIA MAINTAINED IN A REACTION ZONE AT A REACTION TEMPERATURE BELOW 125* F. REACTING SAID SULFURIC ACID SLUDGE AND ANHYDROUS LIQUID AMMONIA TO FORM AMMONIUM SULFATE CRYSTALS, MAINTAINING UNREACTED LIQUID AMMONIA IN THE REACTION ZONE AT ALL TIMES AND WASHING THE AMMONIUM SULFATE CRYSTALS FORMED IN THE REACTION ZONE CONTINUOUSLY WITH SAID UNREACTED ANHYDROUS LIQUID AMMONIA, REMOVING FROM SAID REACTION ZONE AS PRODUCT A SLURRY OF AMMONIUM SULFATE CRYSTALS IN A LIQUID AMMONIA SOLUTION OF AMMONIA SOLUBLE CARBON COMPOUNDS, SAID SLURRY CONTAINING AT LEAST ONE VOLUME OF UNREACTED AMMONIA FOR EACH VOLUME OF SULFURIC ACID SLUDGE CHARGED TO THE REACTION ZONE TO FORM THE AMMONIUM SULFATE CRYSTALS
Claim 2
Independent Claim
134 words
A METHOD FOR PRODUCING AMMONIUM SULFATE FROM SULFURIC ACID SLUDGE CONTAINING DISSOLVED CARBON COMPOUNDS WHICH COMPRISES INTRODUCING SAID SULFURIC ACID SLUDGE INTO A BODY OF ANHYDROUS LIQUID AMMONIA MAINTAINED IN A REACTION ZONE AT A REACTION TEMPERATURE BELOW 125* F. REACTING SAID SULFURIC ACID SLUDGE AND ANHYDROUS LIQUID AMMONIA TO FORM AMMONIUM SULFATE CRYSTALS, MAINTAINING UNREACTED LIQUID AMMONIA IN THE REACTION ZONE AT ALL TIMES AND WASHING THE AMMONIUM SULFATE CRYSTALS FORMED IN THE REACTION ZONE CONTINUOUSLY WITH SAID UNREACTED ANHYDROUS LIQUID AMMONIA, REMOVING FROM SAID REACTION ZONE AS PRODUCT A SLURRY OF AMMONIUM SULFATE CRYSTALS IN A LIQUID AMMONIA SOLUTION OF AMMONIA SOLUBLE CARBON COMPOUNDS, SAID SLURRY CONTAINING AT LEAST ONE VOLUME OF UNREACTED AMMONIA FOR EACH VOLUME OF SULFURIC ACID SLUDGE CHARGED TO THE REACTION ZONE TO FORM THE AMMONIUM SULFATE CRYSTALS
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |