Patent US2708654A successfully refreshed from Google Patents.
US2708654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing lignite fuel product
Assignee: Individual
•
Filing: 1950-11-01
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Granted: 1955-05-17
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Expires: 1970-11-01
Abstract
No abstract record available.
Inventors
- 👤 Henry G Lykken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:26
CPC Classifications
C; C10; C10B; C10B1/00; C10B1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
APPARATUS FOR TREATING LIGNITE WHICH COMPRISES IN SERIES A FIRST ROTARY FURNACE AND A SECOND ROTARY FURNACE; JACKETS SURROUNDING EACH OF SAID FURNACES FOR THE INDIRECT HEATING OF SAID FURNACES BY MEANS OF GASEOUS PRODUCTS OF COMBUSTION; SEALING MEANS POSITIONED INTERMEDIATE OF THE ENDS OF THE SECOND ROTARY FURNACE SEPARATING THE INTERIOR OF THE SECOND FURNACE INTO TWO DISTINCT HEATING ZONES: A FIRST HEATING ZONE AND A SECOND HEATING ZONE; MEANS FOR INTRODUCING A SOLID MATERIAL INTO THE FIRST FURNACE; MEANS FOR SEPARATELY WITHDRAWING THE VAPORS LIBERATED IN THE FIRST FURNACE AND THE GASEOUS PRODUCTS OF COMBUSTION FROM THE JACKET; MEANS FOR COLLECTING THE
Claim 2
Dependent Claim
104 words
APPARATUS FOR TREATING LIGNITE WHICH COMPRISES IN SERIES A FIRST ROTARY FURNACE AND A SECOND ROTARY FURNACE; JACKETS SURROUNDING EACH OF SAID FURNACES FOR THE INDIRECT HEATING OF SAID FURNACES BY MEANS OF GASEOUS PRODUCTS OF COMBUSTION; SEALING MEANS POSITIONED INTERMEDIATE OF THE ENDS OF THE SECOND ROTARY FURNACE SEPARATING THE INTERIOR OF THE SECOND FURNACE INTO TWO DISTINCT HEATING ZONES: A FIRST HEATING ZONE AND A SECOND HEATING ZONE; MEANS FOR INTRODUCING A SOLID MATERIAL INTO THE FIRST FURNACE; MEANS FOR SEPARATELY WITHDRAWING THE VAPORS LIBERATED IN THE FIRST FURNACE AND THE GASEOUS PRODUCTS OF COMBUSTION FROM THE JACKET; MEANS FOR COLLECTING THE
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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) | 1958-05-16 | 1958-11-15 | 1959-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-16 | 1962-11-15 | 1963-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-16 | 1966-11-15 | 1967-05-17 | $7700.00 | Window Closed / Lapsed |