US2507325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bubble tower construction and method of fractionating vapors
Assignee: Petro-Chem Process Co Inc
•
Filing: 1947-11-17
•
Granted: 1950-05-09
•
Expires: 1967-11-17
Abstract
No abstract record available.
Inventors
- 👤 John W Throckmorton
- 👤 John S Wallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:13
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/18; B01D3/20; B01D3/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1624793A
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US1651354A
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US1741519A
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US1744543A
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US1808088A
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US2345667A
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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) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |