US2714065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing machining steel
Assignee: Bethlehem Steel Corp
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Filing: 1951-11-21
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Granted: 1955-07-26
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Expires: 1971-11-21
Abstract
No abstract record available.
Inventors
- 👤 Donald W Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:23
CPC Classifications
C; C21; C21C; C21C7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
IN A PROCESS OF MAKING MACHINING STEEL, THE STEPS OF ADDING TO MOLTEN STEEL IN THE LADLE AMMONIUM SULFATE AND CALCIUM CYANAMID IN COMBINED AMOUNT SUFFICIENT TO RESULT IN A NITROGEN CONTENT OF AT LEAST .010% IN THE FINISHED STEEL, THE AMOUNT OF AMMONIUM SULFATE ADDED BEING APPROXIMATELY TWICE THE AMOUNT OF CALCIUM CYANAMID.
Claim 2
Dependent Claim
54 words
IN A PROCESS OF MAKING MACHINING STEEL, THE STEPS OF ADDING TO MOLTEN STEEL IN THE LADLE AMMONIUM SULFATE AND CALCIUM CYANAMID IN COMBINED AMOUNT SUFFICIENT TO RESULT IN A NITROGEN CONTENT OF AT LEAST .010% IN THE FINISHED STEEL, THE AMOUNT OF AMMONIUM SULFATE ADDED BEING APPROXIMATELY TWICE THE AMOUNT OF CALCIUM CYANAMID.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-25 | 1959-01-24 | 1959-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-25 | 1963-01-24 | 1963-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-25 | 1967-01-24 | 1967-07-26 | $7700.00 | Window Closed / Lapsed |