US2144744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soot blower
Assignee: Hopkinsons Ltd
•
Filing: 1936-02-08
•
Granted: 1939-01-24
•
Expires: 1956-02-08
Abstract
No abstract record available.
Inventors
- 👤 Simpson John William Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:41
CPC Classifications
F; F28; F28G; F28G15/00; F28G15/04; F28G15/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-01-23 | 1942-07-25 | 1943-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-01-23 | 1946-07-25 | 1947-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-01-23 | 1950-07-25 | 1951-01-24 | $7700.00 | Window Closed / Lapsed |