Plating waste recovery unit
Abstract
Abstract IN A UNIT FOR RECLAIMING PLATING WASTES CONTAINING CHROMIC ACID AND THE LIKE, THE RINSE LIQUID, FROM ONE OF A PLURALITY OF WASH TUBS INTO WHICH PLATED ARTICLES ARE DIPPED SUCCESSIVELY TO RINSE OFF THE PLATING SOLUTION, IS CIRCULATED THROUGH AN ION EXCHANGE COLUMN, WHERE IT PASSES THROUGH A RESIN LAYER THAT REMOVES CHROMIC ACID AND OTHER IMPURITIES BEFORE THE LIQUID IS RETURNED TO THE WASH TUB. PERIODICALLY, OR WHEN THE RESIN BECOMES SATURATED WITH CHROMIC ACID, IT IS REGENERATED BY PUMPING A SOLUTION OF CAUSTIC SODA THROUGH THE EXCHANGE COLUMN, THUS PRODUCING A SODIUM CHROMATE SOLUTION TO WHICH BARIUM HYDROXIDE IS ADDED TO PRODUCE BARIUM CHROMATE, WHICH IS FILTERED OUT OF THE CASUTIC SODA SOLUTION BEFORE THE LATTER IS AGAIN USED FOR REGENERATION PURPOSES.
Inventors
- 👤 A Yagishita
Bibliographic Details
Claims Analysis
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |