US3555236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant boiler tube for chemical recovery vapor generating unit
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1968-09-26
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Granted: 1971-01-12
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Expires: 1988-09-26
Abstract
Abstract The disclosure relates to a corrosion resistant boiler tube for chemical recovery vapor generating units, in which a boiler tube of carbon steel or low alloy Cr-M. steel has weld deposited on its exterior surface a coating of high chromium steel containing 13-26 percent Cr and 0.5- 1.5 percent Cb.
Inventors
- 👤 Tsuneto Hayashi
- 👤 Hidejiro Kinoshita
- 👤 Koji Iwahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:25
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/308; F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/08; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A method, as claimed in claim 1, in which said high chromium steel is fusion weld deposited manually.
Claim 2
Dependent Claim
23 words
A method, as claimed in claim 1, in which said high chromium steel is fusion weld deposited by a submerged arc welding process.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |