US3124087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety indicator for heating system
Assignee: —
•
Filing: —
•
Granted: 1964-03-10
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Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:29
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
IN A HEATING SYSTEM HAVING A FURNACE, A COMBUSTION AIR CONDUIT PASSING VERTICALLY FROM AN INLET ABOVE SAID FURNACE TO AN OUTLET IN THE BASE OF SAID FURNACE, (1) SAID FURNACE INCLUDING A COMBUSTION CHAMBER ABOVE AND COMMUNICATING WITH SAID BASE, (2) A SAFETY INDICATOR DEVICE INTERPOSED IN A VERTICAL PORTION OF SAID CONDUIT, (3) A PIVOTED-PLATE-CONTAINING AIR REGULATING VALVE ALSO INTERPOSED IN SAID VERTICAL PORTION OF SAID CONDUIT, IMMEDIATELY ADJACENT AND BELOW SAID INDICATOR DEVICE AND IN OPEN COMMUNICATION WITH SAID INDICATOR DEVICE, (4) THE SAID SAFETY INDICATOR DEVICE INCLUDING A TRANSPARENT CYLINDRICAL CASING OF A HEIGHT APPROXIMATELY TWICE ITS DIAMETER, (5) A ROTATABLE VERTICAL AXIS SPINDLE MOUNTED IN THE CASING EXTENDING THE FULL HEIGHT OF SAID CASING, (6) A PLURAL BLADED FAN SECURED AT THE MIDHEIGHT OF SAID ROTATABLE SPINDLE, (7) WHEREBY AN OBSERVER LOOKING DOWNWARDLY FROM OUTSIDE THE CASING AND ABOVE THE FAN, (8) MAY CLEARLY SIMULTANEOUSLY SEE BOTH THE DEGREE OF ROTATION OF THE FAN AND THE POSITION OF THE PIVOTED PLATE OF THE VALVE, AND BY CONSIDERING THESE SIMULTANEOUS CONDITIONS, DETERMINE WHETHER OR NOT THE CONDUIT IS OPEN OR WHETHER IT MAY BE UNSAFELY CLOGGED SOMEWHERE ALONG ITS LENGTH.
Claim 2
Dependent Claim
194 words
IN A HEATING SYSTEM HAVING A FURNACE, A COMBUSTION AIR CONDUIT PASSING VERTICALLY FROM AN INLET ABOVE SAID FURNACE TO AN OUTLET IN THE BASE OF SAID FURNACE, (1) SAID FURNACE INCLUDING A COMBUSTION CHAMBER ABOVE AND COMMUNICATING WITH SAID BASE, (2) A SAFETY INDICATOR DEVICE INTERPOSED IN A VERTICAL PORTION OF SAID CONDUIT, (3) A PIVOTED-PLATE-CONTAINING AIR REGULATING VALVE ALSO INTERPOSED IN SAID VERTICAL PORTION OF SAID CONDUIT, IMMEDIATELY ADJACENT AND BELOW SAID INDICATOR DEVICE AND IN OPEN COMMUNICATION WITH SAID INDICATOR DEVICE, (4) THE SAID SAFETY INDICATOR DEVICE INCLUDING A TRANSPARENT CYLINDRICAL CASING OF A HEIGHT APPROXIMATELY TWICE ITS DIAMETER, (5) A ROTATABLE VERTICAL AXIS SPINDLE MOUNTED IN THE CASING EXTENDING THE FULL HEIGHT OF SAID CASING, (6) A PLURAL BLADED FAN SECURED AT THE MIDHEIGHT OF SAID ROTATABLE SPINDLE, (7) WHEREBY AN OBSERVER LOOKING DOWNWARDLY FROM OUTSIDE THE CASING AND ABOVE THE FAN, (8) MAY CLEARLY SIMULTANEOUSLY SEE BOTH THE DEGREE OF ROTATION OF THE FAN AND THE POSITION OF THE PIVOTED PLATE OF THE VALVE, AND BY CONSIDERING THESE SIMULTANEOUS CONDITIONS, DETERMINE WHETHER OR NOT THE CONDUIT IS OPEN OR WHETHER IT MAY BE UNSAFELY CLOGGED SOMEWHERE ALONG ITS LENGTH.
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) | 1967-03-10 | 1967-09-09 | 1968-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-10 | 1971-09-09 | 1972-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-10 | 1975-09-09 | 1976-03-10 | $7700.00 | Window Closed / Lapsed |