US3560166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for treatment of substrates by a plurality of fluid reactants
Assignee: Dow Chemical Co
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Filing: 1968-02-05
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Granted: 1971-02-02
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Expires: 1988-02-05
Abstract
Abstract A SYSTEM AND APPARATUS FOR EFFECTING THE CONTINUOUS CHEMICAL TREATMENT OF SUBSTRATES BY LAYERS OF TWO CHEMICAL REACTANTS HAVING DIFFERENT DENSITIES, ONE LIGHTER THAN AIR AND ONE HEAVIER THAN AIR IS DESCRIBED. THE SUBSTRATES ARE LED INTO A VERTICAL CONTAINER HAVING TWO SECTIONS, ONE SECTION HAVING ONE REACTANT, THEN INTO A LAYER OF AIR SEPARATING THE REACTANTS AND THEN INTO THE SECOND SECTION HAVING THE OTHER REACTANT. THE LAYERS OF REACTANTS ARE ESTABLISHED BY VERTICAL WALLS OF A PREDETERMINED HEIGHT AND EXCESS REACTANTS ARE REMOVED BY MEANS OF INTERIOR OR EXTERIOR CHANNELS IN THE SYSTEM.
Inventors
- 👤 Wilhelm E Walles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:47
CPC Classifications
B; B01; B01J; B01J15/00
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |