US3236228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke pipe and damper therefor
Assignee: Hodgins Combustion Devices Ltd
•
Filing: 1963-03-20
•
Granted: 1966-02-22
•
Expires: 1983-03-20
Abstract
No abstract record available.
Inventors
- 👤 Hodgins William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:57
CPC Classifications
F; F23; F23L; F23L13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A SMOKE PIPE ADAPTED TO RUN FROM A FURNACE TO A CHIMNEY AND HAVING A LATERAL AIR ADMISSION BRANCH WITH AN OPEN INLET PORT, A PAIR OF NORMALLY CLOSED DAMPERS IN SAID SMOKE PIPE AND AIR ADMISSION BRANCH RESPECTIVELY, ELECTRICALLY OPERABLE MOTOR MEANS FOR OPERATING SAID DAMPERS IN UNISON FROM A POSITION IN WHICH THE DAMPERS ARE BOTH CLOSED TO A POSITION IN WHICH THE DAMPERS ARE BOTH OPEN, AN AUTOMATIC DRAFT REGULATOR MEANS IN THE
Claim 2
Dependent Claim
76 words
A SMOKE PIPE ADAPTED TO RUN FROM A FURNACE TO A CHIMNEY AND HAVING A LATERAL AIR ADMISSION BRANCH WITH AN OPEN INLET PORT, A PAIR OF NORMALLY CLOSED DAMPERS IN SAID SMOKE PIPE AND AIR ADMISSION BRANCH RESPECTIVELY, ELECTRICALLY OPERABLE MOTOR MEANS FOR OPERATING SAID DAMPERS IN UNISON FROM A POSITION IN WHICH THE DAMPERS ARE BOTH CLOSED TO A POSITION IN WHICH THE DAMPERS ARE BOTH OPEN, AN AUTOMATIC DRAFT REGULATOR MEANS IN THE
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |