Patent US2805174A successfully refreshed from Google Patents.
US2805174A
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Method of impregnation of refractory bodies with phosphoric acid
Assignee: Illinois Clay Products Co
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Filing: 1953-04-07
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Granted: 1957-09-03
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Expires: 1973-04-07
Abstract
No abstract record available.
Inventors
- 👤 John H Veale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:59
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5076; C04B41/5092; C04B41/80; C04B41/81; C04B41/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
THE METHOD OF PRODUCING A DENSE REFRACTORY BODY WHICH COMPRISES SUBJECTING A CLAY FIRE-BRICK HAVING BETWEEN APPROXIMATELY 5% TO 30% PORES THE MAJORITY OF WHICH ARE BELOW .02 OF AN INCH IN DIAMETER TO A VACUUM TO EVACUATE AIR FROM SAID PORES, IMMERSING SAID BRICK IN A HOT, FLUID PHOSPHORIC ACID SUBSTANTIALLY FREE OF WATER AND APPLYING PRESSURE AGAINST SAID PHOSPHORIC ACID TO FORCE PHOSPHORIC ACID INTO THE PORES OF THE BRICK AND SUBSTANTIALLY FILL THE MAJORITY OF SAID PORES AND SUBSTANTIALLY SATURATE SAID BODY, DRAINING EXCESS ACID FROM THE BRICK, AND HEATING SAID BRICK TO ABOVE ABOUT 500*F.
Claim 2
Independent Claim
99 words
THE METHOD OF PRODUCING A DENSE REFRACTORY BODY WHICH COMPRISES SUBJECTING A CLAY FIRE-BRICK HAVING BETWEEN APPROXIMATELY 5% TO 30% PORES THE MAJORITY OF WHICH ARE BELOW .02 OF AN INCH IN DIAMETER TO A VACUUM TO EVACUATE AIR FROM SAID PORES, IMMERSING SAID BRICK IN A HOT, FLUID PHOSPHORIC ACID SUBSTANTIALLY FREE OF WATER AND APPLYING PRESSURE AGAINST SAID PHOSPHORIC ACID TO FORCE PHOSPHORIC ACID INTO THE PORES OF THE BRICK AND SUBSTANTIALLY FILL THE MAJORITY OF SAID PORES AND SUBSTANTIALLY SATURATE SAID BODY, DRAINING EXCESS ACID FROM THE BRICK, AND HEATING SAID BRICK TO ABOVE ABOUT 500*F.
References Cited (Backward Citations)
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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) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |