Patent US3219494A successfully refreshed from Google Patents.
US3219494A
Expired / Lapsed
US
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Method of making high-strength tin plate
Assignee: United States Steel Corp
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Filing: 1962-06-28
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Granted: 1965-11-23
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Expires: 1982-06-28
Abstract
No abstract record available.
Inventors
- 👤 Howard E Hartner
- 👤 Lesney Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:19
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/24; C23C8/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
THE METHOD OF MAKING HIGH-NITROGEN STEEL STRIP FOR HIGH-STRENGTH TIN PLATE AND THE LIKE, COMPRISING: (A) NITRIDING, AFTER ROLLING, STEEL STRIP CONTAINING LESS THAN ABOUT 0.5% OF STRONG NITRIDE FORMERS AND NO MORE THAN A RESIDUAL AMOUNT OF NITROGEN, UNTIL A NITROGEN-RICH CASE IS PRODUCED THEREON WHICH PROVIDES AN AVERAGE NITROGEN CONTENT FOR THE STRIP CROSSSECTION AS A WHOLE OF ABOVE ABOUT 0.010%; AND (B) DIFFUSING THE NITROGEN OF SAID NITROGEN-RICH CASE
Claim 2
Independent Claim
72 words
THE METHOD OF MAKING HIGH-NITROGEN STEEL STRIP FOR HIGH-STRENGTH TIN PLATE AND THE LIKE, COMPRISING: (A) NITRIDING, AFTER ROLLING, STEEL STRIP CONTAINING LESS THAN ABOUT 0.5% OF STRONG NITRIDE FORMERS AND NO MORE THAN A RESIDUAL AMOUNT OF NITROGEN, UNTIL A NITROGEN-RICH CASE IS PRODUCED THEREON WHICH PROVIDES AN AVERAGE NITROGEN CONTENT FOR THE STRIP CROSSSECTION AS A WHOLE OF ABOVE ABOUT 0.010%; AND (B) DIFFUSING THE NITROGEN OF SAID NITROGEN-RICH CASE
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |