Patent US3232797A successfully refreshed from Google Patents.
US3232797A
Expired / Lapsed
US
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Method of nitriding steel
Assignee: Jones and Laughlin Steel Corp
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Filing: 1964-02-28
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Granted: 1966-02-01
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Expires: 1984-02-28
Abstract
No abstract record available.
Inventors
- 👤 Irwin I Bessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:45
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/60; C23C8/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
THE METHOD OF TREATING LOW CARBON STEEL STOCK OF THIN CROSS SECTION CAPABLE OF BEING FORMED INTO A CHARGE IN WHICH SUCCESSIVE LAYERS OF THE STOCK ARE IN CLOSE ABUTTING RELATIONSHIP, COMPRISING COATING THE SURFACE OF THE STEEL STOCK WITH A FILM OF A NITROGEN-RELEASING COMPOUND WHICH DECOMPOSES AND RELEASES THE MAJOR PORTION OF ITS NITROGEN AT A TEMPERATURE ABOVE ABOUT 600*F., FORMING THE STOCK INTO A CHARGE OF SUCCESSIVE LAYERS HAVING THEIR ADJACENT SURACES IN CLOSE ABUTTING RELATIONSHIP WITH EACH OTHER, AND HEATING THE CHARGE TO A TEMPERATURE ABOVE ABOUT 600*F. AT WHICH THE NITROGEN-RELEASING COMPOUND IS SUBSTANTIALLY COMPLETELY DECOMPOSED FOR AT LEAST A HALF AN HOUR IN AN ATMOSPHERE CONSISTING ESSENTIALLY OF THAT RESULTING FROM THE DECOMPOSITION OF THE NITROGEN-RELEASING COMPOUND, SO AS TO NITRIDE THE STEEL.
Claim 2
Independent Claim
129 words
THE METHOD OF TREATING LOW CARBON STEEL STOCK OF THIN CROSS SECTION CAPABLE OF BEING FORMED INTO A CHARGE IN WHICH SUCCESSIVE LAYERS OF THE STOCK ARE IN CLOSE ABUTTING RELATIONSHIP, COMPRISING COATING THE SURFACE OF THE STEEL STOCK WITH A FILM OF A NITROGEN-RELEASING COMPOUND WHICH DECOMPOSES AND RELEASES THE MAJOR PORTION OF ITS NITROGEN AT A TEMPERATURE ABOVE ABOUT 600*F., FORMING THE STOCK INTO A CHARGE OF SUCCESSIVE LAYERS HAVING THEIR ADJACENT SURACES IN CLOSE ABUTTING RELATIONSHIP WITH EACH OTHER, AND HEATING THE CHARGE TO A TEMPERATURE ABOVE ABOUT 600*F. AT WHICH THE NITROGEN-RELEASING COMPOUND IS SUBSTANTIALLY COMPLETELY DECOMPOSED FOR AT LEAST A HALF AN HOUR IN AN ATMOSPHERE CONSISTING ESSENTIALLY OF THAT RESULTING FROM THE DECOMPOSITION OF THE NITROGEN-RELEASING COMPOUND, SO AS TO NITRIDE THE STEEL.
References Cited (Backward Citations)
US1902676A
Cited
US2624744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |