US3477823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical recovery unit
Assignee: Combustion Engineering Inc
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Filing: 1964-12-30
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Granted: 1969-11-11
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Expires: 1984-12-30
Abstract
No abstract record available.
Inventors
- 👤 Jay H Freiday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:09
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0053; D; D21; D21C; D21C11/00; D21C11/12; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00092
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A CHEMICAL RECOVERY UNIT UTILIZING BLACK LIQUOR AS A FUEL AND OPERATING WITH A REDUCING ATMOSPHERE AND INCLUDING IN COMBINATION A CAMERA MOUNTED IN THE WALL OF THE UNIT CLOSE TO THE FURNACE HEARTH FOR VIEWING THE SMELT BED DURING OPERATION OF THE UNIT, A PASSAGEWAY IN SAID WALL DIRECTED TOWARD THE SMELT BED AND WITH WHICH SAID CAMERA IS ASSOCIATED, THE REGION OF THE WALL AT THE LOCATION OF SAID PASSAGEWAY FORMED WITH A PROTRUSION EX-
Claim 2
Dependent Claim
77 words
A CHEMICAL RECOVERY UNIT UTILIZING BLACK LIQUOR AS A FUEL AND OPERATING WITH A REDUCING ATMOSPHERE AND INCLUDING IN COMBINATION A CAMERA MOUNTED IN THE WALL OF THE UNIT CLOSE TO THE FURNACE HEARTH FOR VIEWING THE SMELT BED DURING OPERATION OF THE UNIT, A PASSAGEWAY IN SAID WALL DIRECTED TOWARD THE SMELT BED AND WITH WHICH SAID CAMERA IS ASSOCIATED, THE REGION OF THE WALL AT THE LOCATION OF SAID PASSAGEWAY FORMED WITH A PROTRUSION EX-
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) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |