US3125043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing volatile constituents
Assignee: —
•
Filing: —
•
Granted: 1964-03-17
•
Expires: 1981-03-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:00
CPC Classifications
B; B04; B04C; B04C9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD OF REMOVING CARBON FROM CARBONACEOUS RICE HULL ASH FROM WHICH THE VOLATILE CONSTITUENTS HAVE BEEN REMOVED, COMPRISING THE STEPS OF FORMING A BED OF SUCH CARBONACEOUS ASH, CAUSING OXYGEN-CONTAINING GAS TO FLOW UPWARDLY THERETHROUGH AT A RATE CONTROLLED TO MAINTAIN SAID CARBONACEOUS ASH AT A TEMPERATURE OF GREATER THAN 500*C. AND NOT MORE THAN 800*C. IN THE PRESENCE OF AN OXYGEN-CONTAINING GAS UNTIL SAID CARBON IS REMOVED.
Claim 2
Independent Claim
69 words
A METHOD OF REMOVING CARBON FROM CARBONACEOUS RICE HULL ASH FROM WHICH THE VOLATILE CONSTITUENTS HAVE BEEN REMOVED, COMPRISING THE STEPS OF FORMING A BED OF SUCH CARBONACEOUS ASH, CAUSING OXYGEN-CONTAINING GAS TO FLOW UPWARDLY THERETHROUGH AT A RATE CONTROLLED TO MAINTAIN SAID CARBONACEOUS ASH AT A TEMPERATURE OF GREATER THAN 500*C. AND NOT MORE THAN 800*C. IN THE PRESENCE OF AN OXYGEN-CONTAINING GAS UNTIL SAID CARBON IS REMOVED.
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) | 1967-03-17 | 1967-09-16 | 1968-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-17 | 1971-09-16 | 1972-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-17 | 1975-09-16 | 1976-03-17 | $7700.00 | Window Closed / Lapsed |