Patent US3890143A successfully refreshed from Google Patents.
US3890143A
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Welded constructions of stainless steels
Assignee: Nyby Bruk AB
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Filing: 1973-04-12
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Granted: 1975-06-17
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Expires: 1993-04-12
Abstract
Abstract Tubes and vessels intended for use in handling or housing hot water are formed by welding together sheets of stainless chromium steel having high corrosion resistance, good workability and completely stabilized structure.
Inventors
- 👤 Eric Skoglund
- 👤 Olle Jarleborg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/082; C; C22; C22C; C22C38/00; C22C38/18; C22C38/22; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12639; Y10T428/12646; Y10T428/12653
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
AN ARTICLE COMPRISING AT LEAST ONE WELDED SHEET OF STAINLESS CHROMIUM STEEL CONSISTING ESSENTIALLY OF
Claim 2
Dependent Claim
15 words
AN ARTICLE COMPRISING AT LEAST ONE WELDED SHEET OF STAINLESS CHROMIUM STEEL CONSISTING ESSENTIALLY OF
Claim 3
Dependent Claim
17 words
An article as claimed in claim 1, wherein the chromium content is 18.75 to 19.75% by weight.
Claim 4
Dependent Claim
17 words
An article as claimed in claim 1, wherein the chromium content is 20.5 to 21.5% by weight.
Claim 5
Dependent Claim
17 words
An article as claimed in claim 1, wherein the molybdenum content is 1.5 to 3% by weight.
Claim 6
Dependent Claim
17 words
An article as claimed in claim 4, wherein the molybdenum content is 2 to 3% by weight.
Claim 7
Dependent Claim
35 words
An article as claimed in claim 1, wherein the alloy steel composition includes also a significant amount of a carbon- and nitrogen-binding stabilizing element selected from the group consisting of niobium, tantalum, aluminum and zirconium.
Claim 8
Dependent Claim
17 words
An article as claimed in claim 1, wherein the titanium content is at least 0.3% 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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |