Patent US2647639A successfully refreshed from Google Patents.
US2647639A
Expired / Lapsed
US
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Apparatus for cleaning tanks and the like
Assignee: Individual
•
Filing: 1948-08-12
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Granted: 1953-08-04
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Expires: 1968-08-12
Abstract
No abstract record available.
Inventors
- 👤 Raymond C Grein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:00
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/08; B08B9/093; B08B9/0933
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |