Patent US2548642A successfully refreshed from Google Patents.
US2548642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcining decrepitating rocks, including limestone
Assignee: Dorr Co
•
Filing: 1948-06-11
•
Granted: 1951-04-10
•
Expires: 1968-06-11
Abstract
No abstract record available.
Inventors
- 👤 Frank S White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:27
CPC Classifications
C; C04; C04B; C04B2/00; C04B2/10; C04B2/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
THE PROCESS OF HEAT-TREATING DECREPITATIBLE LIMESTONE MATERIALS TO YIELD LIME UNDER EFFICIENT THERMAL CONDITIONS, WHICH COMPRISES PREHEATING FLUIDIZABLE FINELY DIVIDED LIMESTONE IN A LIMESTONE PREHEATING ZONE, TRANSFERRING SUCH LIMESTONE TO A SUBJACENT CALCINING ZONE, MAINTAIN A BEDBED THEREOF IN SAID ZONE HEATED TO CALCINING TEMPERATURE, SUPPLYING GAS AT FLUIDIZING VELOCITY TO SAID ZONE, REMOVING SUCH GAS WITH ENTRAINED LIME PARTICLES FROM THE CALCINING ZONE, PASSING MOVED GAS THROUGH A LIME SOLIDS-DIMINISHING STATION EXTERNAL TO THE RESPECTIVE ZONES, AND SUPPLYING THE SOLIDS-DIMINISHED GAS TO THE LIMESTONE PREHEATING ZONE AT FLUIDIZING VELOCITIES.
Claim 2
Dependent Claim
90 words
THE PROCESS OF HEAT-TREATING DECREPITATIBLE LIMESTONE MATERIALS TO YIELD LIME UNDER EFFICIENT THERMAL CONDITIONS, WHICH COMPRISES PREHEATING FLUIDIZABLE FINELY DIVIDED LIMESTONE IN A LIMESTONE PREHEATING ZONE, TRANSFERRING SUCH LIMESTONE TO A SUBJACENT CALCINING ZONE, MAINTAIN A BEDBED THEREOF IN SAID ZONE HEATED TO CALCINING TEMPERATURE, SUPPLYING GAS AT FLUIDIZING VELOCITY TO SAID ZONE, REMOVING SUCH GAS WITH ENTRAINED LIME PARTICLES FROM THE CALCINING ZONE, PASSING MOVED GAS THROUGH A LIME SOLIDS-DIMINISHING STATION EXTERNAL TO THE RESPECTIVE ZONES, AND SUPPLYING THE SOLIDS-DIMINISHED GAS TO THE LIMESTONE PREHEATING ZONE AT FLUIDIZING VELOCITIES.
References Cited (Backward Citations)
US394151A
Cited
US685064A
Cited
US2089306A
Cited
US2444990A
Cited
US2367281A
Cited
US2409707A
Cited
US2459824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |