Patent US3273625A successfully refreshed from Google Patents.
US3273625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stack damper and control assembly for furnaces
Assignee: —
•
Filing: —
•
Granted: 1966-09-20
•
Expires: 1983-09-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:34
CPC Classifications
F; F23; F23L; F23L11/00; F23L11/005; F23N; F23N3/00; F23N3/08; F23N3/085; F23N2235/00; F23N2235/02; F23N2235/04; F23N2235/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A STACK DAMPER AND CONTROL ASSEMBLY FOR A FURNACE EQUIPPED WITH A STACK, A BURNER MOTOR AND BURNER MOTOR CONTROL UNIT; THE ASSEMBLY INCLUDING A DAMPER UNIT INTERPOSED BETWEEN THE FURNACE AND STACK, THE DAMPER UNIT COMPRISING A DAMPER CYLINDER, A DISK-SHAPED DAMPER WITHIN SAID CYLINDER, A RECTILINEAR OPERATING SHAFT MOUNTED IN SAID CYLINDER, SAID DAMPER BEING DIAMETRICALLY FIXED TO SAID OPERATING SHAFT, AND A DAMPER CONTROL UNIT OPERATIVELY CONNECTED TO SAID DAMPER UNIT, THE DAMPER CONTROL UNIT INCLUDING UNIDIRECTIONAL, LOW SPEED, HIGH TORQUE MOTOR MEANS IN DIRECT ENGAGEMENT WITH THE OPERATING SHAFT OF SAID DAMPER UNIT, SWITCH MEANS ON SAID DAMPER CONTROL UNIT IN CIRCUIT WITH THE BURNER CONTROL UNIT AND THE BURNER MOTOR, AND SWITCH-ACTUATING MEANS MOUNTED ON SAID OPERATING SHAFT AND ROTATABLE THEREWITH, FOR OPERATING SAID SWITCH MEANS AT PREDETERMINED INTERVALS.
Claim 2
Dependent Claim
134 words
A STACK DAMPER AND CONTROL ASSEMBLY FOR A FURNACE EQUIPPED WITH A STACK, A BURNER MOTOR AND BURNER MOTOR CONTROL UNIT; THE ASSEMBLY INCLUDING A DAMPER UNIT INTERPOSED BETWEEN THE FURNACE AND STACK, THE DAMPER UNIT COMPRISING A DAMPER CYLINDER, A DISK-SHAPED DAMPER WITHIN SAID CYLINDER, A RECTILINEAR OPERATING SHAFT MOUNTED IN SAID CYLINDER, SAID DAMPER BEING DIAMETRICALLY FIXED TO SAID OPERATING SHAFT, AND A DAMPER CONTROL UNIT OPERATIVELY CONNECTED TO SAID DAMPER UNIT, THE DAMPER CONTROL UNIT INCLUDING UNIDIRECTIONAL, LOW SPEED, HIGH TORQUE MOTOR MEANS IN DIRECT ENGAGEMENT WITH THE OPERATING SHAFT OF SAID DAMPER UNIT, SWITCH MEANS ON SAID DAMPER CONTROL UNIT IN CIRCUIT WITH THE BURNER CONTROL UNIT AND THE BURNER MOTOR, AND SWITCH-ACTUATING MEANS MOUNTED ON SAID OPERATING SHAFT AND ROTATABLE THEREWITH, FOR OPERATING SAID SWITCH MEANS AT PREDETERMINED INTERVALS.
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |