US3257992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal burning water tube steam generator construction embodying integral primary coal slagging type furnace and secondary furnace
Assignee: Individual
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Filing: 1964-05-28
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Granted: 1966-06-28
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Expires: 1984-05-28
Abstract
No abstract record available.
Inventors
- 👤 John W Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:36
CPC Classifications
F; F22; F22B; F22B21/00; F22B21/02; F22B21/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A COAL FIRED STEAM GENERATOR FOR THE COMBUSTION OF COAL FINES COMPRISING A SUBSTANTIALLY HORIZONTALLY DISPOSED AND WATER-COOLED SECONDARY FURNACE ENVELOPE HAVING A RADIANT HEAT ABSORBING SURFACE, SAID ENVELOPE BEING PROVIDED WITH A PRIMARY FURNACE RECEIVING ZONE THEREIN, A COAL-FIRED, WATER-COOLED PRIMARY FURNACE WITHIN SAID ZONE SURROUNDED BY SAID ENVELOPE, AND DISPOSED DOWNWARDLY FROM THE INBY END THEREOF WITH RESPECT TO THE HORIZONTAL, THEREBY PERMITTING GRAVITY FLOW OF SLAG THERETHROUGH, SAID PRIMARY FURNACE COMPRISING AN OPEN-ENDED HEAT CONDUCTING EROSION INHIBITING CHAMBER AND A PLURALITY OF TANGENTIALLY DISPOSED TUBES UPON THE EXTERIOR SURFACE OF SAID CHAMBER IN HEAT CONDUCTIVE RELATIONSHIP THEREWITH, AIR SUPPLY MEANS FEEDING INTO SAID ZONE, MEANS TO DISCHARGE SAID COAL FINES INTO SAID PRIMARY FURNACE, SAID CHAMBER AND SAID TUBES BEING ARRANGED TO DIRECT THE COMBUSTION PRODUCTS FROM SAID PRIMARY FURNACE TO AND THROUGH SAID SECONDARY ENVELOPE
Claim 2
Dependent Claim
139 words
A COAL FIRED STEAM GENERATOR FOR THE COMBUSTION OF COAL FINES COMPRISING A SUBSTANTIALLY HORIZONTALLY DISPOSED AND WATER-COOLED SECONDARY FURNACE ENVELOPE HAVING A RADIANT HEAT ABSORBING SURFACE, SAID ENVELOPE BEING PROVIDED WITH A PRIMARY FURNACE RECEIVING ZONE THEREIN, A COAL-FIRED, WATER-COOLED PRIMARY FURNACE WITHIN SAID ZONE SURROUNDED BY SAID ENVELOPE, AND DISPOSED DOWNWARDLY FROM THE INBY END THEREOF WITH RESPECT TO THE HORIZONTAL, THEREBY PERMITTING GRAVITY FLOW OF SLAG THERETHROUGH, SAID PRIMARY FURNACE COMPRISING AN OPEN-ENDED HEAT CONDUCTING EROSION INHIBITING CHAMBER AND A PLURALITY OF TANGENTIALLY DISPOSED TUBES UPON THE EXTERIOR SURFACE OF SAID CHAMBER IN HEAT CONDUCTIVE RELATIONSHIP THEREWITH, AIR SUPPLY MEANS FEEDING INTO SAID ZONE, MEANS TO DISCHARGE SAID COAL FINES INTO SAID PRIMARY FURNACE, SAID CHAMBER AND SAID TUBES BEING ARRANGED TO DIRECT THE COMBUSTION PRODUCTS FROM SAID PRIMARY FURNACE TO AND THROUGH SAID SECONDARY ENVELOPE
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) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |