US2431089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct interior cleaning means
Assignee: Individual
•
Filing: 1943-12-27
•
Granted: 1947-11-18
•
Expires: 1963-12-27
Abstract
No abstract record available.
Inventors
- 👤 Robert F Therrien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:45
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/04; B08B9/043; B08B9/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2005936A
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US2069871A
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US2167268A
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US2272387A
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US2223005A
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US2255800A
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US2236468A
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US2267493A
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US2320309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |