Patent US3243116A successfully refreshed from Google Patents.
US3243116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion control by means of smoke density
Assignee: Shell USA Inc
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Filing: 1963-06-14
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Granted: 1966-03-29
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Expires: 1983-06-14
Abstract
No abstract record available.
Inventors
- 👤 Jacob S Dijt
- 👤 Hoeksema Haje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:15
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/003; F23N5/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
APPARATUS FOR CONTROLLING THE COMBUSTION PROCESS IN A HEATING SYSTEM COMPRISING: A BURNER; A FUEL SUPPLY LINE AND AN AIR SUPPLY LINE CONNECTED TO SAID BURNER; MEANS CONNECTED IN SAID FUEL SUPPLY LINE FOR PRODUCING A SIGNAL PROPORTIONAL TO THE FLOW OF SAID FUEL; MEANS FOR MEASURING THE SMOKE IN THE COMBUSTION GASES FROM SAID BURNER AND PRODUCING A SIGNAL RELATED THEREON; FIRST CONTROLLER MEANS FOR COMPRISING SAID SMOKE SIGNAL WITH A FIRST EXTERNAL SIGNAL HAVING A PRESET VALVE AND PRODUCING AN ERROR SIGNAL PROPORTIONAL TO THE DIFFERENT; MEANS FOR COMBINING SAID SIGNAL PROPORTIONAL TO THE FUEL FLOW AND THE ERROR SIGNAL FROM SAID FIRST CONTROLLER MEANS; MEANS RESPONSIVE TO THE OUTPUT SIGNAL FROM SAID COMBINING MEANS FOR VARYING THE FLOW IN SAID AIR SUPPLY LINE; MEANS FOR MEASURING A VARIABLE OF THE MEDIUM HEATED IN THE SYSTEM AND PRODUCING AN OUTPUT SIGNAL PROPORTIONAL THERETO; SECOND CONTROLLER MEANS FOR COMPARING THE SIGNAL PROPORTIONAL TO A VARIABLE OF THE MEDIUM HEATED IN THE SYSTEM TO A SECOND EXTERNAL SIGNAL HAVING A PRESET VALUE AND PRODUCING AN ERROR SIGNAL PROPORTIONAL TO THE DIFFERENCE; AND, MEANS RESPONSIVE TO THE OUTPUT SIGNAL FROM SAID SECOND CONTROLLER MEANS FOR VARYING THE FLOW IN SAID FUEL SUPPLY LINE.
Claim 2
Dependent Claim
202 words
APPARATUS FOR CONTROLLING THE COMBUSTION PROCESS IN A HEATING SYSTEM COMPRISING: A BURNER; A FUEL SUPPLY LINE AND AN AIR SUPPLY LINE CONNECTED TO SAID BURNER; MEANS CONNECTED IN SAID FUEL SUPPLY LINE FOR PRODUCING A SIGNAL PROPORTIONAL TO THE FLOW OF SAID FUEL; MEANS FOR MEASURING THE SMOKE IN THE COMBUSTION GASES FROM SAID BURNER AND PRODUCING A SIGNAL RELATED THEREON; FIRST CONTROLLER MEANS FOR COMPRISING SAID SMOKE SIGNAL WITH A FIRST EXTERNAL SIGNAL HAVING A PRESET VALVE AND PRODUCING AN ERROR SIGNAL PROPORTIONAL TO THE DIFFERENT; MEANS FOR COMBINING SAID SIGNAL PROPORTIONAL TO THE FUEL FLOW AND THE ERROR SIGNAL FROM SAID FIRST CONTROLLER MEANS; MEANS RESPONSIVE TO THE OUTPUT SIGNAL FROM SAID COMBINING MEANS FOR VARYING THE FLOW IN SAID AIR SUPPLY LINE; MEANS FOR MEASURING A VARIABLE OF THE MEDIUM HEATED IN THE SYSTEM AND PRODUCING AN OUTPUT SIGNAL PROPORTIONAL THERETO; SECOND CONTROLLER MEANS FOR COMPARING THE SIGNAL PROPORTIONAL TO A VARIABLE OF THE MEDIUM HEATED IN THE SYSTEM TO A SECOND EXTERNAL SIGNAL HAVING A PRESET VALUE AND PRODUCING AN ERROR SIGNAL PROPORTIONAL TO THE DIFFERENCE; AND, MEANS RESPONSIVE TO THE OUTPUT SIGNAL FROM SAID SECOND CONTROLLER MEANS FOR VARYING THE FLOW IN SAID FUEL SUPPLY LINE.
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) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |