US3177065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for recovering waste gas from oxygen top blowing converter in unburned state
Assignee: Yawata Iron and Steel Co Ltd
•
Filing: 1962-02-05
•
Granted: 1965-04-06
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Expires: 1982-02-05
Abstract
No abstract record available.
Inventors
- 👤 Okaniwa Keiji
- 👤 Takatama Isao
- 👤 Prefecture Kanagawa
- 👤 Maehara Shigeru
- 👤 Igarashi Isoji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:28
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/38; C21C5/40; Y; Y02; Y02P; Y02P10/00; Y02P10/25; Y10; Y10S; Y10S261/00; Y10S261/09; Y10S261/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2732289A
Cited
CA609053A
Cited
US2855194A
Cited
US2954244A
Cited
US3011966A
Cited
US2993780A
Cited
US3084039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |