Patent US3424659A successfully refreshed from Google Patents.
US3424659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic reduction process using silicic acid coated membrane
Assignee: Bayer Corp
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Filing: 1966-03-14
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Granted: 1969-01-28
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Expires: 1986-03-14
Abstract
No abstract record available.
Inventors
- 👤 Philip Ward Staal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:17
CPC Classifications
C; C25; C25B; C25B15/00; C25B3/00; C25B3/01; C25B3/09; C25B3/20; C25B3/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
AN ELECTROLYTIC PROCESS FOR REDUCING A REDUCIBLE AROMATIC NITRO COMPOUND IN A CELL HAVING AN ANOLYTE BATH AND AN ACIDIC CATHOLYTE BATH SEPARATED BY A SEMIPERMEABLE MEMBRANE, THE IMPROVEMENT COMPRISING EMPLOYING AS THE MEMBRANE AN ACID AND ALKALI CORROSION RESISTANT POROUS MATERIAL HAVING AN AIR PERMEABILITY OF LESS THAN ABOUT 7 CUBIC FEET PER SQUARE FOOT OF FABRIC AREA MEASURED UNDER A 0.5 INCH WATER PRESSURE DROP WITH AIR AT 21* C. AND 65% RELATIVE HUMIDITY, AND USING AS SAID ANOLYTE AN AQUEOUS SOLUTION CONTAINING A SILICATE COMPOUUND WHICH FORMS SILICIC ACID UPON NEUTRALIZATION IN A CONCENTRATION OF ABOUT FROM 15 TO 36 WEIGHT PERCENT BASED UPON THE WEIGHT OF THE WATER AND CONTAINING AN ALKALINE COMPOUND IN AN AMOUNT SUFFICIENT TO MAINTAIN A PH OF AT LEAST ABOUT PH 12.
Claim 2
Dependent Claim
131 words
AN ELECTROLYTIC PROCESS FOR REDUCING A REDUCIBLE AROMATIC NITRO COMPOUND IN A CELL HAVING AN ANOLYTE BATH AND AN ACIDIC CATHOLYTE BATH SEPARATED BY A SEMIPERMEABLE MEMBRANE, THE IMPROVEMENT COMPRISING EMPLOYING AS THE MEMBRANE AN ACID AND ALKALI CORROSION RESISTANT POROUS MATERIAL HAVING AN AIR PERMEABILITY OF LESS THAN ABOUT 7 CUBIC FEET PER SQUARE FOOT OF FABRIC AREA MEASURED UNDER A 0.5 INCH WATER PRESSURE DROP WITH AIR AT 21* C. AND 65% RELATIVE HUMIDITY, AND USING AS SAID ANOLYTE AN AQUEOUS SOLUTION CONTAINING A SILICATE COMPOUUND WHICH FORMS SILICIC ACID UPON NEUTRALIZATION IN A CONCENTRATION OF ABOUT FROM 15 TO 36 WEIGHT PERCENT BASED UPON THE WEIGHT OF THE WATER AND CONTAINING AN ALKALINE COMPOUND IN AN AMOUNT SUFFICIENT TO MAINTAIN A PH OF AT LEAST ABOUT PH 12.
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) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |