Patent US2738967A successfully refreshed from Google Patents.
US2738967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ferguson
Assignee: —
•
Filing: —
•
Granted: 1956-03-20
•
Expires: 1973-03-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:10
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/24; F23N5/242; F23D; F23D14/00; F23D14/46; F23D14/72; C; C10; C10M; C10M2207/00; C10M2207/02; C10M2207/023; F23N2231/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
AN INDUSTRIAL FURNACE SAFETY DEVICE COMPRISING AN IGNITION ELEMENT ADAPTED TO PROJECT INTO THE LOWER PART OF A FURNACE, SAID ELEMENT INCLUDING AN ELECTRICAL RESISTOR SEALED IN A TUBE, CONDUIT MEANS ASSOCIATED WITH SAID ELEMENT FOR INTRODUCING A PREDETERMINED ATMOSPHERE INTO THE FURNACE, A VALVE IN SAID CONDUIT MEANS, AN ELECTRIC CIRCUIT CONNECTED WITH SAID RESISTOR FOR MAINTAINING THE TEMPERATURE OF SAID TUBE ABOVE THE IGNITION TEMPERATURE
Claim 2
Dependent Claim
67 words
AN INDUSTRIAL FURNACE SAFETY DEVICE COMPRISING AN IGNITION ELEMENT ADAPTED TO PROJECT INTO THE LOWER PART OF A FURNACE, SAID ELEMENT INCLUDING AN ELECTRICAL RESISTOR SEALED IN A TUBE, CONDUIT MEANS ASSOCIATED WITH SAID ELEMENT FOR INTRODUCING A PREDETERMINED ATMOSPHERE INTO THE FURNACE, A VALVE IN SAID CONDUIT MEANS, AN ELECTRIC CIRCUIT CONNECTED WITH SAID RESISTOR FOR MAINTAINING THE TEMPERATURE OF SAID TUBE ABOVE THE IGNITION TEMPERATURE
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |