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 10:57
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)
US1670819A
Cited
US2095253A
Cited
US2575113A
Cited
US1535240A
Cited
US2474941A
Cited
US2506913A
Cited
US2487752A
Cited
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 |