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US2286157A
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Method of securing countercurrent contact between fluids
Assignee: BENJAMIN B SCHNEIDER
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Filing: 1937-08-06
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Granted: 1942-06-09
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Expires: 1957-08-06
Abstract
No abstract record available.
Inventors
- 👤 Walter J Podbielniak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:33
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0446; B01D11/0461; B04; B04B; B04B5/00; B04B5/06
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) | 1945-06-08 | 1945-12-08 | 1946-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-06-08 | 1949-12-08 | 1950-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-06-08 | 1953-12-08 | 1954-06-09 | $7700.00 | Window Closed / Lapsed |