US2707674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for activating furnace blacks
Assignee: Columbian Carbon Co
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Filing: 1952-11-25
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Granted: 1955-05-03
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Expires: 1972-11-25
Abstract
No abstract record available.
Inventors
- 👤 Carl W Sweitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:22
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
PROCESS FOR THE ACTIVATION OF FURNACE BLACKS WITHOUT SUBSTANTIAL LOSS IN WEIGHT AND WITHOUT SUBSTANTIAL REDUCTION IN PARTICLE SIZE WHICH COMPRISES UNIFORMLY HEATING A QUIESCENT, SHALLOW BED OF THE FURNACE BLACK, OF A THICKNESS NOT EXCEEDING ABOUT 1/4 INCH, TO A BLACK-HEAT TEMPERATURE NOT LOWER THAN 650* F. BUT BELOW THE INGITION TEMPERATURE OF THE PARTICULAR BLACK, NO PORTION OF THE BED OF BLACK BEING PERMITTED TO EXCEED A BLACK-HEAT TEMPERATURE, WHILE PASSING AIR OVER, AND IN CONTACT WITH, THE SURFACE OF THE BED OF HEATED BLACK, AND CONTINUING THE TREATMENT UNTIL THE PH CHARACTERISTIC OF THE BLACK HAS BECOME ACIDIC.
Claim 2
Dependent Claim
101 words
PROCESS FOR THE ACTIVATION OF FURNACE BLACKS WITHOUT SUBSTANTIAL LOSS IN WEIGHT AND WITHOUT SUBSTANTIAL REDUCTION IN PARTICLE SIZE WHICH COMPRISES UNIFORMLY HEATING A QUIESCENT, SHALLOW BED OF THE FURNACE BLACK, OF A THICKNESS NOT EXCEEDING ABOUT 1/4 INCH, TO A BLACK-HEAT TEMPERATURE NOT LOWER THAN 650* F. BUT BELOW THE INGITION TEMPERATURE OF THE PARTICULAR BLACK, NO PORTION OF THE BED OF BLACK BEING PERMITTED TO EXCEED A BLACK-HEAT TEMPERATURE, WHILE PASSING AIR OVER, AND IN CONTACT WITH, THE SURFACE OF THE BED OF HEATED BLACK, AND CONTINUING THE TREATMENT UNTIL THE PH CHARACTERISTIC OF THE BLACK HAS BECOME ACIDIC.
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) | 1958-05-02 | 1958-11-01 | 1959-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-02 | 1962-11-01 | 1963-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-02 | 1966-11-01 | 1967-05-03 | $7700.00 | Window Closed / Lapsed |