US3003756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pellet furnace
Assignee: Bethlehem Steel Corp
•
Filing: 1958-08-18
•
Granted: 1961-10-10
•
Expires: 1978-08-18
Abstract
No abstract record available.
Inventors
- 👤 Steffensen Percy Lea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:14
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/2413; F; F27; F27B; F27B1/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
127 words
A METHOD OF TREATING PELLETS OF IRON ORE OR THE LIKE, COMPRISING THE STEPS OF MAINTAINING A CONTINUOUS DESCENT OF PELLETS THROUGH A SHAFT FURNACE, HEATING SAID PELLETS TO A HIGH TEMPERATURE IN SAID SHAFT FURNACE, INTRODUCING AIR AT THE BOTTOM OF THE SHAFT FURNACE AND DIRECTING SAID AIR VERTICALLY UPWARDLY IN COUNTERFLOW HEAT TRANSFERRING RELATION THROUGH THE DESCENDING PELLETS IN SAID SHAFT FURNACE, COOLING THE PELLETS THEREAFTER IN A SEPARATE CHAMBER BY DIRECTING A BODY OF OTHER AIR IN HEAT TRANSFER THERETHROUGH, CLEANING SAID BODY OF AIR, AND UTILIZING THE HEAT RETAINED IN SAID BODY OF CLEANED AIR TO PREHEAT A COMPLETELY SEPARATE BODY OF CLEAN OUTSIDE AIR, AND SUPPLYING ONLY SAID PREHEATED CLEAN AIR TO A COMBUSTION CHAMBER WHICH GIVES ITS HEAT TO THE FURNACE.
References Cited (Backward Citations)
DE330785C
Cited
US2194454A
Cited
US2668041A
Cited
US2848208A
Cited
US2744743A
Cited
US2701622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |