Patent US2999010A successfully refreshed from Google Patents.
US2999010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of superphosphoric acid
Assignee: Tennessee Valley Authority
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Filing: 1957-03-25
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Granted: 1961-09-05
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Expires: 1977-03-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Marcus M Striplin
- 👤 Mcknight David
- 👤 Ellis C Marks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:49
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF SUPERPHOSPHORIC ACID WHICH COMPRISES THE STEPS OF BURNING PHOSPHORUS IN AIR, PASSING THE RESULTING HOT VAPOROUS PHOSPHORUS PENTOXIDE MIXTURE UPWARD THROUGH A VERTICAL HYDRATION ZONE, INTRODUCING A RELATIVELY COOL CONDENSATE OF DILUATE PHOSPHORIC ACID FROM A LATER-MENTIONED STEP INTO SAID HYDRATION ZONE AS A SPRAY OF FREE-FALLING DROPLETS, INTRODUCING A SPRAY OF WATER INTO SAID HYDRATION ZONE AT POSITIONS THEREIN SPACED VERTICALLY ABOVE THE POSITION OF SAID ACID INTRODUCTION, ADJUSTING THE RELATIVE PROPORTIONS OF SAID ACID AND SAID WATER INTRODUCED SO AS TO MAINTAIN A CONCENTRATION OF ABOUT 72% TO 79% P2O5 IN
Claim 2
Dependent Claim
100 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF SUPERPHOSPHORIC ACID WHICH COMPRISES THE STEPS OF BURNING PHOSPHORUS IN AIR, PASSING THE RESULTING HOT VAPOROUS PHOSPHORUS PENTOXIDE MIXTURE UPWARD THROUGH A VERTICAL HYDRATION ZONE, INTRODUCING A RELATIVELY COOL CONDENSATE OF DILUATE PHOSPHORIC ACID FROM A LATER-MENTIONED STEP INTO SAID HYDRATION ZONE AS A SPRAY OF FREE-FALLING DROPLETS, INTRODUCING A SPRAY OF WATER INTO SAID HYDRATION ZONE AT POSITIONS THEREIN SPACED VERTICALLY ABOVE THE POSITION OF SAID ACID INTRODUCTION, ADJUSTING THE RELATIVE PROPORTIONS OF SAID ACID AND SAID WATER INTRODUCED SO AS TO MAINTAIN A CONCENTRATION OF ABOUT 72% TO 79% P2O5 IN
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) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |