Patent US4316435A successfully refreshed from Google Patents.
Patent US3694307A successfully refreshed from Google Patents.
US3694307A
Expired / Lapsed
US
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Process for removing chlorine from pulp cooking agents
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1970-08-12
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Granted: 1972-09-26
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Expires: 1990-08-12
Abstract
Abstract DECHLORINATION OF PULP COOKING LIQUORS IN EITHER CONTINUOUS OR BATCHWISE MANNER FROM RECOVERY BOILER SYSTEM IN PAPER PULP MANUFACTURE IS EFFECTED BY ACIDIFICATION WITH SULFURIC ACID FOLLOWED BY ELECTROLYSIS USING AN INSOLUBLE ANODE SUCH AS TITANIUM PLATED WITH PLATINUM, OR LEAD DIOXIDE, AND WITH CAST IRON CATHODE.
Inventors
- 👤 Koji Iwahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:28
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/06; D21C11/063; D21C11/066; Y; Y10; Y10S; Y10S162/00; Y10S162/08
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |