US3661537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welded pipe structure of high strength low alloy steels
Assignee: Jones and Laughlin Steel Inc
•
Filing: 1969-07-16
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Granted: 1972-05-09
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Expires: 1989-07-16
Abstract
Abstract A steel composition having particular applicability to the manufacture of high-strength, low-alloy line pipe comprises 0.10 to 0.20 percent carbon, 0.85 to 1.25 percent manganese, 0.10 percent maximum phosphorus, 0.05 percent maximum sulfur, silicon in an amount not adversely affecting steel properties, 0.02 to 0.05 percent columbium, 0.10 percent maximum vanadium, an inclusion shape-control agent selected from the group consisting of zirconium, a rare earth or mischmetal, the balance iron.
Inventors
- 👤 Arthur H Aronson
- 👤 Edward J Lichy
- 👤 Clifford A Guess
- 👤 Norman L Samways
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:58
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
20 words
A welded pipe structure as defined in claim 1 wherein the inclusion shape-control agent comprises 0.04 to 0.20 percent zirconium.
Claim 2
Dependent Claim
23 words
A welded pipe structure as defined in claim 1 wherein the inclusion shape-control agent comprises 0.01 to 0.10 percent of a rare earth.
Claim 3
Dependent Claim
20 words
A welded pipe structure as defined in claim 1 wherein the inclusion shape-control agent comprises 0.01 to 0.10 percent mischmetal.
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US3544393A
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US3562028A
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |