US3015540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of superphosphoric acid
Assignee: Tennessee Valley Authority
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Filing: 1960-11-23
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Granted: 1962-01-02
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Expires: 1980-11-23
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
2026-11-03 12:19
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF SUPERPHOSPHORIC ACID WHICH COMPRISES THE STEPS OF BURNING PHOSPHORUS IN AIR; PASSING THE RESULTING HOT PHOSPHORUS PENTOXIDE AT AN INITIAL TEMPERATURE IN THE RANGE FROM ABOUT 700*F. TO ABOUT 1400*F. INTO A VERTICAL HYDRATION ZONE; INTRODUCING WATER INTO SAID HYDRATION ZONE; INTRODUCING DILUTE PHOSPHORIC ACID, CONTAINING FROM ABOUT 40 PERCENT TO ABOUT 70 PERCENT P2O5 FROM A LATER-MENTIONED STEP, AT A TEMPERATURE IN THE RANGE FROM ABOUT 150*F.
Claim 2
Dependent Claim
75 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF SUPERPHOSPHORIC ACID WHICH COMPRISES THE STEPS OF BURNING PHOSPHORUS IN AIR; PASSING THE RESULTING HOT PHOSPHORUS PENTOXIDE AT AN INITIAL TEMPERATURE IN THE RANGE FROM ABOUT 700*F. TO ABOUT 1400*F. INTO A VERTICAL HYDRATION ZONE; INTRODUCING WATER INTO SAID HYDRATION ZONE; INTRODUCING DILUTE PHOSPHORIC ACID, CONTAINING FROM ABOUT 40 PERCENT TO ABOUT 70 PERCENT P2O5 FROM A LATER-MENTIONED STEP, AT A TEMPERATURE IN THE RANGE FROM ABOUT 150*F.
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) | 1965-01-01 | 1965-07-03 | 1966-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-01 | 1969-07-03 | 1970-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-01 | 1973-07-03 | 1974-01-02 | $7700.00 | Window Closed / Lapsed |