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US2554428A
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US
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Distillation tower
Assignee: Mathieson Chemical Corp
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Filing: 1946-11-26
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Granted: 1951-05-22
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Expires: 1966-11-26
Abstract
No abstract record available.
Inventors
- 👤 Judson S Swearingen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:52
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1314802A
Cited
GB120304A
Cited
US1868886A
Cited
US2152251A
Cited
US2088691A
Cited
US2183943A
Cited
US2299130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |