US3148026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of siliceous pigment
Assignee: Evonik Operations GmbH
•
Filing: 1961-05-23
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Granted: 1964-09-08
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Expires: 1981-05-23
Abstract
No abstract record available.
Inventors
- 👤 Gerd Roderburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:20
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/309; C08; C08K; C08K9/00; C08K9/04; C09C3/00; C09C3/04; C09C3/043; C09C3/08; C01; C01P; C01P2004/00; C01P2004/50; C01P2004/80; C01P2006/00; C01P2006/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE PROCESS OF REMOVING FREE AND BOUND WATER FROM A HYDRATED SILICEOUS PIGMENT, THE IMPROVEMENT WHICH COMPRISES COATING THE SILICEOUS PIGMENT WITH AN ORGANIC NITROGEN-CONTAINING COMPOUND, HEATING THE COATED PIGMENT IN THE PRESENCE OF FREE OXYGEN TO A TEMPERATURE EQUIVALENT TO AT LEAST THE INFLAMMATION POINT OF ORGANIC NITROGEN COMPOUND, ADJUSTING THE AMOUNT OF FREE OXYGEN TO CORRESPOND WITH THE AMOUNT OF SAID COATING WHEREBY TO PERMIT COPLETELY COMBUSTION OF THE COATING WITHIN 2 SECONDS, EXPLOSIVELY BURNING THE COATING COMPLETELY WITHIN 2 SECONDS AND THEREAFTER SUBJECTING THE RESULTING PIGMENT TO 600*C. TO 800*C. HEAT TREATMENT IN ANA AIR ATOMSPHERE FOR A PERIOD OF TIME NOT EXCEEDING 60 SECONDS.
Claim 2
Dependent Claim
109 words
IN THE PROCESS OF REMOVING FREE AND BOUND WATER FROM A HYDRATED SILICEOUS PIGMENT, THE IMPROVEMENT WHICH COMPRISES COATING THE SILICEOUS PIGMENT WITH AN ORGANIC NITROGEN-CONTAINING COMPOUND, HEATING THE COATED PIGMENT IN THE PRESENCE OF FREE OXYGEN TO A TEMPERATURE EQUIVALENT TO AT LEAST THE INFLAMMATION POINT OF ORGANIC NITROGEN COMPOUND, ADJUSTING THE AMOUNT OF FREE OXYGEN TO CORRESPOND WITH THE AMOUNT OF SAID COATING WHEREBY TO PERMIT COPLETELY COMBUSTION OF THE COATING WITHIN 2 SECONDS, EXPLOSIVELY BURNING THE COATING COMPLETELY WITHIN 2 SECONDS AND THEREAFTER SUBJECTING THE RESULTING PIGMENT TO 600*C. TO 800*C. HEAT TREATMENT IN ANA AIR ATOMSPHERE FOR A PERIOD OF TIME NOT EXCEEDING 60 SECONDS.
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) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |