US2645467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leaning bubble tower
Assignee: Standard Oil Development Co
•
Filing: 1951-01-25
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Granted: 1953-07-14
•
Expires: 1971-01-25
Abstract
No abstract record available.
Inventors
- 👤 Walter H Rupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:29
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/24
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) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |