Patent US2074052A successfully refreshed from Google Patents.
US2074052A
Expired / Lapsed
US
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Apparatus for cleaning the interior of tanks
Assignee: Butterworth System Inc
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Filing: 1933-06-29
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Granted: 1937-03-16
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Expires: 1953-06-29
Abstract
No abstract record available.
Inventors
- 👤 Leonard B George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:00
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/08; B08B9/093; B08B9/0936; B05; B05B; B05B13/00; B05B13/06; B05B13/0627; B05B13/0636; B05B3/00; B05B3/02; B05B3/04; B05B3/06; B05B3/066
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) | 1940-03-15 | 1940-09-14 | 1941-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-03-15 | 1944-09-14 | 1945-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-03-15 | 1948-09-14 | 1949-03-16 | $7700.00 | Window Closed / Lapsed |