Patent US3443934A successfully refreshed from Google Patents.
US3443934A
Expired / Lapsed
US
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Steel alloys resistant to sulfuric acid and containing small quantity of alloying elements of copper,chromium,and tin or antimony
Assignee: JFE Engineering Corp
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Filing: 1966-04-05
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Granted: 1969-05-13
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Expires: 1986-04-05
Abstract
No abstract record available.
Inventors
- 👤 Hirovuki Kubota
- 👤 Tohru Mimino
- 👤 Yuh Fukuda
- 👤 Yoshio Ishizu
- 👤 Toshio Nago
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:17
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/20; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; C22C38/16; C22C38/40; C22C38/42; C22C38/60
Claims Analysis
Total Claims: 0
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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) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |