Patent US2237661A successfully refreshed from Google Patents.
Patent US2516029A successfully refreshed from Google Patents.
US4171218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anticorrosive bellows
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1978-05-18
•
Granted: 1979-10-16
•
Expires: 1998-05-18
Abstract
Abstract An anticorrosive bellows made of stainless steel containing 0.10% by weight or less of C, 2.5-5% by weight of Si, 2% by weight or less of Mn, 15-20% by weight of Cr, 10-22% by weight of Ni, 10 times or more as much as the C content but at most 2.5% by weight of at least one element selected from the group consisting of Ta and Zr, and the remainder consisiting substantially of Fe shows excellent corrosion resistance even under strongly corrosive circumstances, e.g. fuming or concentrated nitric acid. Said stainless steel has improved workability, weldability and endurance and the produced bellows can be used as a bellows valve, a bellows joint, and the like.
Inventors
- 👤 Taiji Hoshino
- 👤 Masao Okubo
- 👤 Masayoshi Miki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/28; C22C38/26; F; F16; F16J; F16J3/00; F16J3/04; F16J3/047; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49877
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
An anticorrosive bellows made of stainless steel consisting essentially of 0.10% by weight or less of C, 2.5-5% by weight of Si, 2% by weight or less of Mn, 15-20% by weight of Cr, 10-22% by weight of Ni, 10 times or more as much as the C content but at most 2.5% by weight of at least one element selected from the group consisting of Ta, Zr and a mixture of Nb with Ta or/and Zr, and the remainder consisting substantially of Fe.
Claim 2
Dependent Claim
84 words
An anticorrosive bellows made of stainless steel consisting essentially of 0.10% by weight or less of C, 2.5-5% by weight of Si, 2% by weight or less of Mn, 15-20% by weight of Cr, 10-22% by weight of Ni, 10 times or more as much as the C content but at most 2.5% by weight of at least one element selected from the group consisting of Ta, Zr and a mixture of Nb with Ta or/and Zr, and the remainder consisting substantially of Fe.
Claim 3
Dependent Claim
11 words
A bellows valve comprising the anticorrosive bellows according to claim 1.
Claim 4
Dependent Claim
12 words
A bellows joint made of the anticorrosive bellows according to claim 1.
References Cited (Backward Citations)
US2225730A
Cited
GB758009A
Cited
US2984563A
Cited
US2920954A
Cited
US3429160A
Cited
US3615368A
Cited
US4000984A
Cited
US4108641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |