Patent US3239391A successfully refreshed from Google Patents.
US3239391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale free flame heating of steel
Assignee: —
•
Filing: —
•
Granted: 1966-03-08
•
Expires: 1983-03-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:45
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/34; C21D1/44; C21D1/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
AN IMPROVED METHOD OF HEATING HOT ROLLED STEEL HAVING MILL SCALE THEREON WITH MINIMUM LOSS OF WEIGHT AND SURFACE DECARBURIZATION, COMPRISING LOADING STEEL WHILE COLD INTA A GAS OR OIL FIRED FURNACE, INTRODUCING INTO REFRACTORY LINED BURNER OPENINGS OF SASID FURNACE, SEPARATELY FROM THE FUEL AND COMBUSTION AIR, A VOLATILE COMPOUND OF BORON WHICH IGNITES FORMING BORIC ANHYDRIDE MIST WHICH MIXES WITH THE PRODUCTS OF COMBUSTION AND AIR IN FLIGHT THROUGH SAID REFRACTORY LINED BURNER OPENINGS LEADING INTO THE FURNACE, AND DEPOSITS BORIC ANHYDRIDE
Claim 2
Dependent Claim
84 words
AN IMPROVED METHOD OF HEATING HOT ROLLED STEEL HAVING MILL SCALE THEREON WITH MINIMUM LOSS OF WEIGHT AND SURFACE DECARBURIZATION, COMPRISING LOADING STEEL WHILE COLD INTA A GAS OR OIL FIRED FURNACE, INTRODUCING INTO REFRACTORY LINED BURNER OPENINGS OF SASID FURNACE, SEPARATELY FROM THE FUEL AND COMBUSTION AIR, A VOLATILE COMPOUND OF BORON WHICH IGNITES FORMING BORIC ANHYDRIDE MIST WHICH MIXES WITH THE PRODUCTS OF COMBUSTION AND AIR IN FLIGHT THROUGH SAID REFRACTORY LINED BURNER OPENINGS LEADING INTO THE FURNACE, AND DEPOSITS BORIC ANHYDRIDE
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |