US2980412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary furnace
Assignee: Selas Corp of America
•
Filing: 1957-09-26
•
Granted: 1961-04-18
•
Expires: 1977-09-26
Abstract
No abstract record available.
Inventors
- 👤 Koerner Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:52
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/34; C21D1/44; C21D1/46; F; F27; F27B; F27B14/00; Y; Y10; Y10S; Y10S266/00; Y10S266/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US248801A
Cited
US490451A
Cited
US2899189A
Cited
US631414A
Cited
US1362296A
Cited
GB266368A
Cited
US2507274A
Cited
US2499926A
Cited
US2680011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |