Patent US3753788A successfully refreshed from Google Patents.
US3753788A
Expired / Lapsed
US
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Non-ribbing ferritic steel and process
Assignee: J and L Specialty Products Corp
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Filing: 1971-10-15
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Granted: 1973-08-21
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Expires: 1991-10-15
Abstract
Abstract Low carbon ferritic stainless steel containing about 14-18 percent chromium, 0.0005 to 0.005 percent boron, up to about 0.12 percent, and preferably 0.02 to 0.12 percent columbium, characterized by substantial freedom from ribbing in unidirectionally hot rolling and thence unidirectionally cold rolling into thin gauge strip; also cold rolled strip in long lengths made of said steel and methods of producing same.
Inventors
- 👤 J Fogarty
- 👤 S Odar
- 👤 G Angerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:27
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
The method according to claim 1 wherein said steel is cast into ingots of at least 25 X 36 inches in size.
Claim 2
Dependent Claim
21 words
The method according to claim 2 wherein said strip is cold rolled to final gauge of about 0.015 to 0.025 inch.
Claim 3
Dependent Claim
63 words
The method according to claim 1 wherein said steel as cast consists essentially of about: 14 to 18 percent chromium, 0.7 to 1 percent molybdenum, 0.0005 to 0.005 percent boron, 0.02 to 0.12% columbium, up to 0.12% carbon, up to 1% each of manganese and silicon, up to 0.03 and 0.04% sulphur and phosphorus, respectively, balance iron, except for impurities within commercial tolerances.
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |