US2822798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burner tube assembly for heat treating furnaces
Assignee: Individual
•
Filing: 1953-10-19
•
Granted: 1958-02-11
•
Expires: 1973-10-19
Abstract
No abstract record available.
Inventors
- 👤 Harold N Ipsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:17
CPC Classifications
F; F23; F23C; F23C3/00; F23C3/002; F22; F22B; F22B1/00; F22B1/02; F22B1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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CH277788A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |