US3216843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of carbon black
Assignee: Columbian Carbon Co
•
Filing: 1962-12-21
•
Granted: 1965-11-09
•
Expires: 1982-12-21
Abstract
No abstract record available.
Inventors
- 👤 George L Heller
- 👤 Norman N Mcree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:27
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C01; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN THE PROCESS FOR TREATING A FURNACE CARBON BLACK WITH OZONE TO MODIFY THE CHARACTERISTICS OF THE CARBON BLACK BY SUSPENDING IT IN AN OZONE-CONTAINING GAS, THE IMPROVEMENT COMPRISING THE FOLLOWING STEPS IN SEQUENCE: (A) RESUSPENDING A FURNACE CARBON BLACK, WHICH HAS PREVIOUSLY BEEN SEPARATED AND COLLECTED IN POWDER FORM FROM THE EFFLUENT FURNACE GASES IN WHICH IT WAS PRODUCED, TO FORM AN AEROSOL IN A GAS CONSISTING ESSENTIALLY OF DRIED AIR TO SUBSTANTIALLY REDUCE THE MOISTURE AND OCCLUDED GAS CONTENT OF THE CARBON BLACK; (B) SEPARATING THE CARBON BLACK FROM THE AIR AND DESORBED MOISTURE AND OCCLUDED GASES; (C) RESUSPENDING THE CARBON BLACK FROM STEP (B) TO FORM AN AEROSOL IN OZONE-CONTAINING DRIED AIR AT A TEMPERATURE NOT EXCEEDING 300*F. TO EFFECT REACTION OF THE OZONE WITH THE CARBON BLACK; AND (D) SEPARATING THE TREATED CARBON BLACK FROM THE AEROSOL OF STEP (C).
Claim 2
Dependent Claim
144 words
IN THE PROCESS FOR TREATING A FURNACE CARBON BLACK WITH OZONE TO MODIFY THE CHARACTERISTICS OF THE CARBON BLACK BY SUSPENDING IT IN AN OZONE-CONTAINING GAS, THE IMPROVEMENT COMPRISING THE FOLLOWING STEPS IN SEQUENCE: (A) RESUSPENDING A FURNACE CARBON BLACK, WHICH HAS PREVIOUSLY BEEN SEPARATED AND COLLECTED IN POWDER FORM FROM THE EFFLUENT FURNACE GASES IN WHICH IT WAS PRODUCED, TO FORM AN AEROSOL IN A GAS CONSISTING ESSENTIALLY OF DRIED AIR TO SUBSTANTIALLY REDUCE THE MOISTURE AND OCCLUDED GAS CONTENT OF THE CARBON BLACK; (B) SEPARATING THE CARBON BLACK FROM THE AIR AND DESORBED MOISTURE AND OCCLUDED GASES; (C) RESUSPENDING THE CARBON BLACK FROM STEP (B) TO FORM AN AEROSOL IN OZONE-CONTAINING DRIED AIR AT A TEMPERATURE NOT EXCEEDING 300*F. TO EFFECT REACTION OF THE OZONE WITH THE CARBON BLACK; AND (D) SEPARATING THE TREATED CARBON BLACK FROM THE AEROSOL OF STEP (C).
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |