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Patent US3152890A successfully refreshed from Google Patents.
US3152890A
Expired / Lapsed
US
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Free machining steel with sulphur plus tellurium and/or selenium
Assignee: Inland Steel Co
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Filing: 1963-11-14
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Granted: 1964-10-13
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Expires: 1983-11-14
Abstract
No abstract record available.
Inventors
- 👤 Michael O Holowaty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:55
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A FREE MACHINING, AT LEAST PARTIALLY HOT WORKED STEEL CONSISTING ESSENTIALLY OF, IN WT. PERCENT: 0.10-0.18 CARBON; 0.60-0.75 MANGANESE; 0.012-0.04 PHOSPHORUS; 0.02-0.10 OF A FIRST MACHINABI-LITY INCREASING ADDITION SELECTED FROM THE GROUP CONSISTING OF TELLURIUM, SELENIUM, AND TELLURIUM PLUS SELENIUM; SULPHUR IN WT, PERCENT NO GREATE THAN THE WT. PERCENT OF SAID FIRST ADDITION; THE MINIMUM WT. PERCENT OF SAID SULPHUR BEING IN MOLECULAR EXCESS OF THE WT. PERCENT OF SAID FIRST ADDITION; NO MORE THAN ABOUT 0.05 SILICON; AND THE BALANCE CONSISTING ESSENTIALLY OF IRON.
Claim 2
Dependent Claim
86 words
A FREE MACHINING, AT LEAST PARTIALLY HOT WORKED STEEL CONSISTING ESSENTIALLY OF, IN WT. PERCENT: 0.10-0.18 CARBON; 0.60-0.75 MANGANESE; 0.012-0.04 PHOSPHORUS; 0.02-0.10 OF A FIRST MACHINABI-LITY INCREASING ADDITION SELECTED FROM THE GROUP CONSISTING OF TELLURIUM, SELENIUM, AND TELLURIUM PLUS SELENIUM; SULPHUR IN WT, PERCENT NO GREATE THAN THE WT. PERCENT OF SAID FIRST ADDITION; THE MINIMUM WT. PERCENT OF SAID SULPHUR BEING IN MOLECULAR EXCESS OF THE WT. PERCENT OF SAID FIRST ADDITION; NO MORE THAN ABOUT 0.05 SILICON; AND THE BALANCE CONSISTING ESSENTIALLY OF IRON.
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) | 1967-10-13 | 1968-04-13 | 1968-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-13 | 1972-04-13 | 1972-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-13 | 1976-04-13 | 1976-10-13 | $7700.00 | Window Closed / Lapsed |