Patent US3336148A successfully refreshed from Google Patents.
US3336148A
Expired / Lapsed
US
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Nitric acid treatment of carbon black
Assignee: Phillips Petroleum Co
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Filing: 1964-02-26
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Granted: 1967-08-15
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Expires: 1984-02-26
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Gunnell
- 👤 Yuan C Fu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:50
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A PROCESS FOR TREATING A FURNACE CARBON BLACK HAVING A DIPHENYLGUANIDINE ADSORPTION VALUE SUBSTANTIALLY LESS THAN 35 MICROEQUIVALENTS PER GRAM OF BLACK AND A VOLATILE MATTER CONTENT SUBSTANTIALLY BELOW 3 WEIGHT PERCENT, WHICH COMPRISES THE STEPS OF: (1) INTIMATELY CONTACTING SAID BLACK WITH AN EFFECTIVE WEIGHT PROPORTIONS OF DILUTE NITRIC ACID FOR EFFECTING THE VALUES OF THE STEP (3); (2) HEATING SAID BLACK WHILE IN CONTACT WITH SAID ACID IN AN AMBIENT HAVING A PARTIAL PRESSURE OF AT LEAST 0.1 ATMOSPHERE OF O2 AT A TEMPERATURE IN THE RANGE OF 680 TO 900*F.; AND (3) CONTINUING THE HEATING OF STEP (2) FOR A PERIOD IN THE RANGE OF 10 MINUTES TO 120 MINUTES UNTIL THE DIPHENYLGUANIDINE ADSORPTION VALUE THEREOF IS AT LEAST 35 MICROEQUIVALENTS PER GRAMS OF BLACK AND THE VOLATILE MATTER CONTENT THEREOF IS AT LEAST 3 WEIGHT PERCENT.
Claim 2
Dependent Claim
140 words
A PROCESS FOR TREATING A FURNACE CARBON BLACK HAVING A DIPHENYLGUANIDINE ADSORPTION VALUE SUBSTANTIALLY LESS THAN 35 MICROEQUIVALENTS PER GRAM OF BLACK AND A VOLATILE MATTER CONTENT SUBSTANTIALLY BELOW 3 WEIGHT PERCENT, WHICH COMPRISES THE STEPS OF: (1) INTIMATELY CONTACTING SAID BLACK WITH AN EFFECTIVE WEIGHT PROPORTIONS OF DILUTE NITRIC ACID FOR EFFECTING THE VALUES OF THE STEP (3); (2) HEATING SAID BLACK WHILE IN CONTACT WITH SAID ACID IN AN AMBIENT HAVING A PARTIAL PRESSURE OF AT LEAST 0.1 ATMOSPHERE OF O2 AT A TEMPERATURE IN THE RANGE OF 680 TO 900*F.; AND (3) CONTINUING THE HEATING OF STEP (2) FOR A PERIOD IN THE RANGE OF 10 MINUTES TO 120 MINUTES UNTIL THE DIPHENYLGUANIDINE ADSORPTION VALUE THEREOF IS AT LEAST 35 MICROEQUIVALENTS PER GRAMS OF BLACK AND THE VOLATILE MATTER CONTENT THEREOF IS AT LEAST 3 WEIGHT PERCENT.
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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) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |