US3615082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace muffle
Assignee: BTU Engineering Corp
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Filing: 1969-09-02
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Granted: 1971-10-26
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Expires: 1989-09-02
Abstract
Abstract A FURNACE MUFFLE OF UNIQUE WELDED CONSTRUCTION AND ESPECIALLY ADAPTED FOR OPERATION AT EXTREME OPERATING TEMPERATURES. THE MUFFLE IS FORMED AS AN ELONGATED TUBULAR MEMBER HAVING ONE OR MORE GAS PIPES INTEGRALLY FORMED THEREIN TO INTRODUCE A GASEOUS ATMOSPHERE WITHIN THE MUFFLE. THE ENTIRE MUFFLE STRUCTURE INCLUDING THE GAS PIPES IS FORMED OF A METAL WHICH HAS EXPERIENCED THE SAME WORK HISTORY DURING FABRICATION, AND INDIVIDUAL ELEMENTS OF THE MUFFLE STRUCTURE ARE WELDED IN A UNIQUE MANNER TO PROVIDE A UNITARY STRUCTURE ARE WELDED IN A UNIQUE MANNER TO PROVIDE TION AT ELEVATED TEMPERATURES.
Inventors
- 👤 Jacob Howard Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:23
CPC Classifications
B; B01; B01J; B01J6/00; C; C21; C21D; C21D9/00; C21D9/0043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |