US3248270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing deep drawing steel
Assignee: Bethlehem Steel Corp
•
Filing: 1961-07-18
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Granted: 1966-04-26
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Expires: 1981-07-18
Abstract
No abstract record available.
Inventors
- 👤 Laidman John Neil
- 👤 Edward H Mayer
- 👤 Frederick B Schunk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:43
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C21D8/0447; C21D8/0468; C21D8/0457; C21D8/0478; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/939; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T29/49986
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD OF PRODUCING A COATED STEEL STRIP COMPRISING ROLLING TO INTERMEDIATE GAUGE STRIP, UNDER SUCH CONDITIONS THAT SAID STEEL IS FREE OF CRITICAL STRAIN, A STEEL CONSISTING ESSENTIALLY OF 0.30% MAX. CARBON, 0.20 TO 1.7% MANGANESE, 0.040% MAX. PHOSPHORUS, 0.040% MAX. SULFUR, 0.04% MAX. SILICON, BALANCE IRON, DECARBURIZING SAID STEEL TO A CARBON CONTENT OF LESS THAN .010% AT A TEMPERATURE INSUFFICIENT TO CAUSE EXCESSIVE GRAIN GROWTH THEREIN, COLD REDUCING SAID STEEL DIRECTLY TO FINAL GAUGE BY AN AMOUNT, AT LEAST EQUAL TO 15%, WHICH UPON CONTINUOUS ANNEALING WILL PRODUCE A STEEL HAVING A GRAIN SIZE OF 100 TO 200 GRAINS PER SQUARE INCH AT 100 MAGNIFICATIONS, CONTINUOUSLY ANNEALING SAID STEEL BELOW THE LOWER CRITICAL TEMPERATURE, AND COATING SAID STEEL WITH MOLTEN METAL.
Claim 2
Independent Claim
124 words
A METHOD OF PRODUCING A COATED STEEL STRIP COMPRISING ROLLING TO INTERMEDIATE GAUGE STRIP, UNDER SUCH CONDITIONS THAT SAID STEEL IS FREE OF CRITICAL STRAIN, A STEEL CONSISTING ESSENTIALLY OF 0.30% MAX. CARBON, 0.20 TO 1.7% MANGANESE, 0.040% MAX. PHOSPHORUS, 0.040% MAX. SULFUR, 0.04% MAX. SILICON, BALANCE IRON, DECARBURIZING SAID STEEL TO A CARBON CONTENT OF LESS THAN .010% AT A TEMPERATURE INSUFFICIENT TO CAUSE EXCESSIVE GRAIN GROWTH THEREIN, COLD REDUCING SAID STEEL DIRECTLY TO FINAL GAUGE BY AN AMOUNT, AT LEAST EQUAL TO 15%, WHICH UPON CONTINUOUS ANNEALING WILL PRODUCE A STEEL HAVING A GRAIN SIZE OF 100 TO 200 GRAINS PER SQUARE INCH AT 100 MAGNIFICATIONS, CONTINUOUSLY ANNEALING SAID STEEL BELOW THE LOWER CRITICAL TEMPERATURE, AND COATING SAID STEEL WITH MOLTEN METAL.
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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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |