US2725360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of activated carbon
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1951-06-23
•
Granted: 1955-11-29
•
Expires: 1971-06-23
Abstract
No abstract record available.
Inventors
- 👤 Warren K Lewis
- 👤 Arthur B Metzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:10
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/342; C01B32/348
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR PREPARING AN ACTIVATED CARBON IN YEILDS OF AT LEAST 60% BASED ON THE ORIGINAL CARBON WHICH COMPRISES CONTACTING A WOOD CHARCOAL AT A TEMPERATURE OF 500* TO 600* C. WITH SUFFICIENT SULFUR VAPOR TO FORM A SOLID CARBON-SULFUR COMPLEX HAVING A SULFUR CONTENT IN THE RANGE OF 30 TO 50 WEIGHT PERCENT AND THEREAFTER HEATING SAID CARBON-SULFUR COMPLEX IN AN ATMOSPHERE OF HYDROGEN AT A TEMPERATURE BETWEEN 800* AND 900* C. UNTIL THE SULFUR CONTENT OF THE CARBON IS REDUCED BELOW 2 WEIGHT PERCENT BY CONVERSION OF THE SULFUR INTO VOLATILE FORM.
Claim 2
Dependent Claim
95 words
A PROCESS FOR PREPARING AN ACTIVATED CARBON IN YEILDS OF AT LEAST 60% BASED ON THE ORIGINAL CARBON WHICH COMPRISES CONTACTING A WOOD CHARCOAL AT A TEMPERATURE OF 500* TO 600* C. WITH SUFFICIENT SULFUR VAPOR TO FORM A SOLID CARBON-SULFUR COMPLEX HAVING A SULFUR CONTENT IN THE RANGE OF 30 TO 50 WEIGHT PERCENT AND THEREAFTER HEATING SAID CARBON-SULFUR COMPLEX IN AN ATMOSPHERE OF HYDROGEN AT A TEMPERATURE BETWEEN 800* AND 900* C. UNTIL THE SULFUR CONTENT OF THE CARBON IS REDUCED BELOW 2 WEIGHT PERCENT BY CONVERSION OF THE SULFUR INTO VOLATILE FORM.
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) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |