US2902270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and means in heating of subsurface fuel-containing deposits "in situ"
Assignee: Svenska Skifferolje AB
•
Filing: 1953-09-01
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Granted: 1959-09-01
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Expires: 1973-09-01
Abstract
No abstract record available.
Inventors
- 👤 Salomonsson Gosta Joha Wilhelm
- 👤 Persson Bengt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:12
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A METHOD OF HEATING WHICH COMPRISES MAINTAINING FLAME-DEVELOPED COMBUSTION AT A CENTRAL COMBUSTION ZONE, CONDUCTING THE HOT FLUE GASES IN A FLOW PASSAGE LEADING AWAY FORM SAID COMBUSTION ZONE, REVERSING THE FLOW OF SAID FLUE GASES, AND CONDUCTING SAID REVERSED FLOW OF FLUE GASES IN A ZONE SURROUNDING SAID FLOW PASSAGE AND SAID COMBUSTION ZONE SURROUNDING CURRENT OT THE DIRECTION OF FLOW OF THE FLUE GASES FROM SAID COMBUSTION ZONE, THE FLOW PASSAGE AND THE ZONE SURROUNDING SAID FLOW PASSAGE BEING MECHANICALLY SEPARATE BUT IN HEAT CONDUCTING RELATION WITH EACH OTHER, AND THE ZONE SURROUNDING SAID FLOW PASSAGE BEING SEALED AGAINST EXIT OF GASES THEREFROM TO MATERIAL UNDERGOING HEATING, THEREBY COMBINING THE IFFECTS OF RADIATION AND CONVECTION FROM BOTH THE FLAME AND THE FLUE GASES TO GIVE AN ELONGATED HEATING ZONE OF SUBSTANTIALLY UNIFORM TEMPERATURE.
Claim 2
Independent Claim
135 words
A METHOD OF HEATING WHICH COMPRISES MAINTAINING FLAME-DEVELOPED COMBUSTION AT A CENTRAL COMBUSTION ZONE, CONDUCTING THE HOT FLUE GASES IN A FLOW PASSAGE LEADING AWAY FORM SAID COMBUSTION ZONE, REVERSING THE FLOW OF SAID FLUE GASES, AND CONDUCTING SAID REVERSED FLOW OF FLUE GASES IN A ZONE SURROUNDING SAID FLOW PASSAGE AND SAID COMBUSTION ZONE SURROUNDING CURRENT OT THE DIRECTION OF FLOW OF THE FLUE GASES FROM SAID COMBUSTION ZONE, THE FLOW PASSAGE AND THE ZONE SURROUNDING SAID FLOW PASSAGE BEING MECHANICALLY SEPARATE BUT IN HEAT CONDUCTING RELATION WITH EACH OTHER, AND THE ZONE SURROUNDING SAID FLOW PASSAGE BEING SEALED AGAINST EXIT OF GASES THEREFROM TO MATERIAL UNDERGOING HEATING, THEREBY COMBINING THE IFFECTS OF RADIATION AND CONVECTION FROM BOTH THE FLAME AND THE FLUE GASES TO GIVE AN ELONGATED HEATING ZONE OF SUBSTANTIALLY UNIFORM TEMPERATURE.
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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) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |