US3345846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal heating
Assignee: Selas Corp of America
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Filing: 1966-08-01
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Granted: 1967-10-10
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Expires: 1986-08-01
Abstract
No abstract record available.
Inventors
- 👤 Frederic O Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:35
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74; B; B21; B21J; B21J17/00; C21D7/00; C21D7/13; F; F27; F27D; F27D7/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
THE METHOD OF HEATING WITHOUT SCALING A MATERIAL THAT OXIDIZES AT ELEVATED TEMPERATURES WHICH COMPRISES PLACING THE MATERIAL IN THE COMBUSTION ZONE OF A DIRECT FIRED FURNACE HAVING BURNERS IN THE WALL THEREOF, SUPPLYING FUEL GAS AND AIR TO THE BURNERS, REGULATING SAID SUPPLIES TO SUBSTANTIALLY STOICHIOMETRIC PROPORTIONS, BURNING THE FUEL AND AIR TO HEAT THE MATERIAL TO A TEMPERATURE WHERE SURFACE OXIDATION WILL BEGIN TO TAKE PLACE, CHANGING THE FUEL-AIR RATIO TO THE BURNERS SO THAT THERE IS AT LEAST A 40% DEFICIENCY OF AIR, THEREBY CREATING A REDUCING ATMOSPHERE, AND CONTINUING TO HEAT THE MATERIAL IN SAID REDUCING ATMOSPHERE UNTIL THE MATERIAL HAS REACHED THE FINAL DESIRED TEMPERATURE.
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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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |