Patent US2813009A successfully refreshed from Google Patents.
US2813009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon black
Assignee: Columbian Carbon Co
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Filing: 1952-03-14
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Granted: 1957-11-12
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Expires: 1972-03-14
Abstract
No abstract record available.
Inventors
- 👤 Wesley C Ekholm
- 👤 George L Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:08
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PROCESS FOR PRODUCING FURNACE BLACK FROM LIQUID HYDROCARBONS, WHICH COMPRISES PASSING A RELATIVELY NONTURBULENT STREAM OF FREE OXYGEN-CONTAINING GAS UPWARDLY THROUGH A VERTICALLY ELONGATED CHAMBER, BURNING A GASEOUS FUEL IN CONTACT WITH THE FREE OXYGERN-CONTAINING GAS ABOUT THE PERIPHERY ONLY OF THE CHAMBER IN A ZONE THEREOF JUST BELOW A ZONE OF PARTIAL COMBUSTION POSITIONED IN THE UPPER END OF SAID CHAMBER TO FORM RADIANT FLAME ABOUT THE PERIPHERY OF SAID LOWER ZONE AND THEREBY SUBJECTING THE INTERIOR PORTION OF SAID LOWER ZONE TO RADIANT HEAT FROM THE PERIPHERAL FLAME AND FROM THE SAID ZONE OF PARTIAL COMBUSTION, SEPARATELY SPRAYING A STREAM OF THE LIQUID HYDROCARBONS UPWARDLY THROUGH THE SAID INTERIOR PORTION OF THE LOWER ZONE OF THE FURNACE CHAMBER FROM A POINT BELOW THE LEVEL OF THE PERIPHERAL FLAME AND OUT OF CONTACT WITH THE PERIPHERAL FLAMAE AND SAID SURFACES
Claim 2
Dependent Claim
142 words
A PROCESS FOR PRODUCING FURNACE BLACK FROM LIQUID HYDROCARBONS, WHICH COMPRISES PASSING A RELATIVELY NONTURBULENT STREAM OF FREE OXYGEN-CONTAINING GAS UPWARDLY THROUGH A VERTICALLY ELONGATED CHAMBER, BURNING A GASEOUS FUEL IN CONTACT WITH THE FREE OXYGERN-CONTAINING GAS ABOUT THE PERIPHERY ONLY OF THE CHAMBER IN A ZONE THEREOF JUST BELOW A ZONE OF PARTIAL COMBUSTION POSITIONED IN THE UPPER END OF SAID CHAMBER TO FORM RADIANT FLAME ABOUT THE PERIPHERY OF SAID LOWER ZONE AND THEREBY SUBJECTING THE INTERIOR PORTION OF SAID LOWER ZONE TO RADIANT HEAT FROM THE PERIPHERAL FLAME AND FROM THE SAID ZONE OF PARTIAL COMBUSTION, SEPARATELY SPRAYING A STREAM OF THE LIQUID HYDROCARBONS UPWARDLY THROUGH THE SAID INTERIOR PORTION OF THE LOWER ZONE OF THE FURNACE CHAMBER FROM A POINT BELOW THE LEVEL OF THE PERIPHERAL FLAME AND OUT OF CONTACT WITH THE PERIPHERAL FLAMAE AND SAID SURFACES
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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) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |