US3415231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing soot from boiler tubes and apparatus therefor
Assignee: Individual
•
Filing: 1968-01-03
•
Granted: 1968-12-10
•
Expires: 1988-01-03
Abstract
No abstract record available.
Inventors
- 👤 Reale Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:21
CPC Classifications
F; F28; F28G; F28G3/00; F28G3/16; F28G3/166
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) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |