Patent US3311074A successfully refreshed from Google Patents.
US3311074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stoker-fired, coal-burning heater
Assignee: Individual
•
Filing: 1965-07-06
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Granted: 1967-03-28
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Expires: 1985-07-06
Abstract
No abstract record available.
Inventors
- 👤 John L Margetts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:18
CPC Classifications
F; F23; F23K; F23K3/00; F23K3/10; F23K3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A STOKER-FIRED, COAL-BURNING HEATER, COMPRISING A HOUSING; PARTITION WALLS WITHIN SAID HOUSING DEFINING A HOPPER FOR COAL TO BE BURNED; A FIREBOWL WITHIN SAID HOUSING REMOTE FROM THE HOPPER; A COAL FEED TUBE EXTENDING FROM THE HOPPER TO THE FIREBOWL: FEED MEANS FOR MOVING COAL THROUGH SAID TUBE FROM THE HOPPER TO THE FIREBOWL; A MOTOR; DRIVE MEANS CONNECTING THE MOTOR WITH THE SAID FEED MEANS, WHEREBY SAID MOTOR OPERATES SAID FEED MEANS; A FAN, DRIVEN BY THE MOTOR; DUCT MEANS FOR CARRYING AIR FROM THE FAN TO THE FIREBOWL; AND MEANS ARRANGING THE FAN TO DISCHARGE AIR AGAINST THE MOTOR BEFORE PASSAGE INTO THE DUCT MEANS.
Claim 2
Dependent Claim
107 words
A STOKER-FIRED, COAL-BURNING HEATER, COMPRISING A HOUSING; PARTITION WALLS WITHIN SAID HOUSING DEFINING A HOPPER FOR COAL TO BE BURNED; A FIREBOWL WITHIN SAID HOUSING REMOTE FROM THE HOPPER; A COAL FEED TUBE EXTENDING FROM THE HOPPER TO THE FIREBOWL: FEED MEANS FOR MOVING COAL THROUGH SAID TUBE FROM THE HOPPER TO THE FIREBOWL; A MOTOR; DRIVE MEANS CONNECTING THE MOTOR WITH THE SAID FEED MEANS, WHEREBY SAID MOTOR OPERATES SAID FEED MEANS; A FAN, DRIVEN BY THE MOTOR; DUCT MEANS FOR CARRYING AIR FROM THE FAN TO THE FIREBOWL; AND MEANS ARRANGING THE FAN TO DISCHARGE AIR AGAINST THE MOTOR BEFORE PASSAGE INTO THE DUCT MEANS.
References Cited (Backward Citations)
US459518A
Cited
US2141831A
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US1206071A
Cited
US1880840A
Cited
US2170277A
Cited
US2378376A
Cited
US2507245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |