Patent US2865622A successfully refreshed from Google Patents.
US2865622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pigments
Assignee: EIDP Inc
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Filing: 1955-08-30
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Granted: 1958-12-23
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Expires: 1975-08-30
Abstract
No abstract record available.
Inventors
- 👤 William D Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:18
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/08; B; B01; B01J; B01J6/00; B01J6/001; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3615; C09C1/363; C09C3/00; C09C3/04; C09C3/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
IN A PROCESS FOR CALCINING A PIGMENTARY MATERIAL WHEREIN SAID MATERIAL IS PASSED THROUGH A HORIZONTALLY INCLINED ROTARY KILN FROM ITS RAISED END, WHILE PASSING INTO THE LOW END AND THROUGH SAID KILN, HOT COMBUSTION GASES AND AIR AT ABOUT THE MAXIMUM GAS TEMPERATURE FOR SAID CALCINING PROCESS, THE IMPROVEMENT WHICH COMPRISES INTRODUCING A FLUID FUEL IN AN AMOUNT LESS THAN THE CHEMICAL EQUIVALENT OF THE OXYGEN IN SAID COMBUSTION GASES AND AIR INTO THE INTERIOR GAS SPACE OF SAID KILN WHERE THE PIGMENT TEMPERATURE IS SUBSTANTIALLY BELOW MAXIMUM, AND BURNING SAID FUEL IN AN AXIALLY POSITIONED FLAME MAINTAINED IN SAID GAS SPACE WITH A PORTION OF THE OXYGEN IN THE GAS STREAM.
Claim 2
Dependent Claim
113 words
IN A PROCESS FOR CALCINING A PIGMENTARY MATERIAL WHEREIN SAID MATERIAL IS PASSED THROUGH A HORIZONTALLY INCLINED ROTARY KILN FROM ITS RAISED END, WHILE PASSING INTO THE LOW END AND THROUGH SAID KILN, HOT COMBUSTION GASES AND AIR AT ABOUT THE MAXIMUM GAS TEMPERATURE FOR SAID CALCINING PROCESS, THE IMPROVEMENT WHICH COMPRISES INTRODUCING A FLUID FUEL IN AN AMOUNT LESS THAN THE CHEMICAL EQUIVALENT OF THE OXYGEN IN SAID COMBUSTION GASES AND AIR INTO THE INTERIOR GAS SPACE OF SAID KILN WHERE THE PIGMENT TEMPERATURE IS SUBSTANTIALLY BELOW MAXIMUM, AND BURNING SAID FUEL IN AN AXIALLY POSITIONED FLAME MAINTAINED IN SAID GAS SPACE WITH A PORTION OF THE OXYGEN IN THE GAS STREAM.
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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |