Patent US3279526A successfully refreshed from Google Patents.
US3279526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of phosphoric acids
Assignee: Armour and Co
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Filing: 1964-03-25
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Granted: 1966-10-18
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Expires: 1984-03-25
Abstract
No abstract record available.
Inventors
- 👤 Jr William R Mustian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:34
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN A PROCESS IN WHICH WET PROCESS PHOSPHORIC ACID CONCENTRATED IN AN EVAPORATOR CHAMBER BY HEATING A BODY OF SAID ACID THROUGH CONTACT WITH HOT COMBUSTION GASES, THE STEPS OF DIRECTING SAID HOT COMBUSTION GASES DOWNWARDLY IN A GENERALLY VERTICAL DIP PIPE WHICH NORMALLY AT ZERO GAS VELOCITY EXTENDS BELOW THE ACID LEVEL AND DISCHARGING SAID GASES FROM THE BOTTOM OF THE DIP PIPE UPON SAID WET PHOSPHORIC ACID AT A VELOCITY TO PRESS THE TOP SURFACE OF SAID ACID BODY AWAY FROM THE BOTTOM OF SAID DIP PIPE, AND WITHDRAWING CONCENTRATED ACID PRODUCT FROM THE CHAMBER, THE VELOCITY IN FEET PER MINUTE OF THE COMBUSTION GASES IN SAID AREA PIPE BEARING A RATIO TO THE ANNULUS CROSS-SECTIONAL AREA IN SQUARE INCHES BETWEEN THE BOTTOM OF THE DIP PIPE AND THE NEAREST POINT OF THE EVAPORATOR CHAMBER OF IN EXCESS OF 6.5.
Claim 2
Dependent Claim
142 words
IN A PROCESS IN WHICH WET PROCESS PHOSPHORIC ACID CONCENTRATED IN AN EVAPORATOR CHAMBER BY HEATING A BODY OF SAID ACID THROUGH CONTACT WITH HOT COMBUSTION GASES, THE STEPS OF DIRECTING SAID HOT COMBUSTION GASES DOWNWARDLY IN A GENERALLY VERTICAL DIP PIPE WHICH NORMALLY AT ZERO GAS VELOCITY EXTENDS BELOW THE ACID LEVEL AND DISCHARGING SAID GASES FROM THE BOTTOM OF THE DIP PIPE UPON SAID WET PHOSPHORIC ACID AT A VELOCITY TO PRESS THE TOP SURFACE OF SAID ACID BODY AWAY FROM THE BOTTOM OF SAID DIP PIPE, AND WITHDRAWING CONCENTRATED ACID PRODUCT FROM THE CHAMBER, THE VELOCITY IN FEET PER MINUTE OF THE COMBUSTION GASES IN SAID AREA PIPE BEARING A RATIO TO THE ANNULUS CROSS-SECTIONAL AREA IN SQUARE INCHES BETWEEN THE BOTTOM OF THE DIP PIPE AND THE NEAREST POINT OF THE EVAPORATOR CHAMBER OF IN EXCESS OF 6.5.
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |