US3226244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making high color carbon black pigments
Assignee: Cabot Corp
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Filing: 1961-12-15
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Granted: 1965-12-28
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Expires: 1981-12-15
Abstract
No abstract record available.
Inventors
- 👤 Merrill E Jordan
- 👤 John F Hardy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:18
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS FOR PRODUCING PIGMENTS COMPRISING TREATING A CARBON BLACK HAVING AN AVERAGE ELECTRON MICROSCOPE PARTICLE DIAMETER OF AT LEAST ABOUT 15 MILLIMICRONS AND A POROSITY BELOW ABOUT 200 WITH MOLECULAR OXYGEN AT ELEVATED TEMPERATURES TO PRODUCE AN INTERMEDIATE PRODUCT HAVING A POROSITY BETWEEN ABOUT 220 AND 400, REACTING AN AQUEOUS SLURRY OF THE SAID INTERMEDIATE PRODUCT WITH AN OXIDIZING AGENT CHOSEN FROM THE GROUP CONSISTING OF NITRIC ACIDS AND NITRIC OXIDES TO INCREASE THE VOLATILE CONTENT OF SAID INTERMEDIATE PRODUCT BY AT LEAST 40% AND HEATING THE SO PRODUCED PIGMENT UNTIL SUBSTANTIALLY DRY.
Claim 2
Dependent Claim
94 words
A PROCESS FOR PRODUCING PIGMENTS COMPRISING TREATING A CARBON BLACK HAVING AN AVERAGE ELECTRON MICROSCOPE PARTICLE DIAMETER OF AT LEAST ABOUT 15 MILLIMICRONS AND A POROSITY BELOW ABOUT 200 WITH MOLECULAR OXYGEN AT ELEVATED TEMPERATURES TO PRODUCE AN INTERMEDIATE PRODUCT HAVING A POROSITY BETWEEN ABOUT 220 AND 400, REACTING AN AQUEOUS SLURRY OF THE SAID INTERMEDIATE PRODUCT WITH AN OXIDIZING AGENT CHOSEN FROM THE GROUP CONSISTING OF NITRIC ACIDS AND NITRIC OXIDES TO INCREASE THE VOLATILE CONTENT OF SAID INTERMEDIATE PRODUCT BY AT LEAST 40% AND HEATING THE SO PRODUCED PIGMENT UNTIL SUBSTANTIALLY DRY.
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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |