Patent US3239389A successfully refreshed from Google Patents.
US3239389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep drawing cold rolled rimmed steel sheet and strip and production of the same
Assignee: JFE Steel Corp
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Filing: 1963-06-11
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Granted: 1966-03-08
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Expires: 1983-06-11
Abstract
No abstract record available.
Inventors
- 👤 Yoshida Hiroshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:03
CPC Classifications
C; C21; C21D; C21D3/00; C21D3/02; C21D3/04; C21D8/00; C21D8/02; C21D8/04; C21D8/0447; C21D8/0457; C22; C22C; C22C38/00; C22C38/12; C22C38/60; C21D3/08; C21D8/0473
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A METHOD FOR PRODUCING COLD ROLLED RIMMED STEEL SHEET AND STRIP HAVING GOOD DRAWABILITY AND STRETCHABIITY COMPRISING THE STEPS OF ADDING LEAD TO MOLTEN STEEL TO PRODUCE A RIMMED STEEL CONTAINING SAID ELEMENT IN AN AMOUNT OF 0.003-0.100% BY WEIGHT, MAKING A COLD ROLLED RIMMED STEEL SHEET OR STRIP THROUGH HOT AND COLD ROLLING PROCEDURE, AND SUBJECTING SAID STEEL SHEET OR STRIP TO A DECARBURIZING ANNEAL TO DECREASE ITS CARBON CONTENT TO LESS THAN 0.020% BY WEIGHT.
Claim 2
Independent Claim
77 words
A METHOD FOR PRODUCING COLD ROLLED RIMMED STEEL SHEET AND STRIP HAVING GOOD DRAWABILITY AND STRETCHABIITY COMPRISING THE STEPS OF ADDING LEAD TO MOLTEN STEEL TO PRODUCE A RIMMED STEEL CONTAINING SAID ELEMENT IN AN AMOUNT OF 0.003-0.100% BY WEIGHT, MAKING A COLD ROLLED RIMMED STEEL SHEET OR STRIP THROUGH HOT AND COLD ROLLING PROCEDURE, AND SUBJECTING SAID STEEL SHEET OR STRIP TO A DECARBURIZING ANNEAL TO DECREASE ITS CARBON CONTENT TO LESS THAN 0.020% BY WEIGHT.
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 |