Patent US1778162A successfully refreshed from Google Patents.
Patent US2815318A successfully refreshed from Google Patents.
US2815318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of caustic soda
Assignee: Imperial Chemical Industries Ltd
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Filing: 1953-07-30
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Granted: 1957-12-03
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Expires: 1973-07-30
Abstract
No abstract record available.
Inventors
- 👤 Shaw Harry
- 👤 Mcgavin Arnold Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:01
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/36; C25B1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN THE MANUFACTURE OF ALKALI METAL HYDROXIDE BY FIRST ELECTROLYSING AN ALKALI METAL CHLORIDE SOLUTION USING A FLOWING MERCURY CATHODE AND THEREAFTER REACTING THE ALKALI METAL AMALGAM, SO FORMED, WITH WATER IN A SEPARATE VESSEL FROM WHICH MERCURY LEAVES AT A TEMPERATURE HIGHER THAN THE TEMPERATURE OF THE ALKALI META AMALGAM ENTERING THE SAME, THE IMPROVEMENT WHICH COMPRISES TRANSFERRING HEAT FROM THE HOT MERCURY WHICH HAS LEFT SAID VESSEL TO THE COLD AMALGAM ENTERING SAID VESSEL THROUGH THE MEDIUM OF AN AQUEOUS FLUID WHICH IS SUCCESSIVELY BROUGHT INTO DIRECT HEAT TRANSFER RELATIONSHIP WIT BOTH THE HOT MERCURY WHICH HAS LEFT SAID VESSEL AND THE COLD AMALGAM ENTERING SAID VESSEL, SAID WATER BEING SEPARATED FROM SAID MERCURY PRIOR TO SAID ELECTROLYZING STAGE.
Claim 2
Dependent Claim
121 words
IN THE MANUFACTURE OF ALKALI METAL HYDROXIDE BY FIRST ELECTROLYSING AN ALKALI METAL CHLORIDE SOLUTION USING A FLOWING MERCURY CATHODE AND THEREAFTER REACTING THE ALKALI METAL AMALGAM, SO FORMED, WITH WATER IN A SEPARATE VESSEL FROM WHICH MERCURY LEAVES AT A TEMPERATURE HIGHER THAN THE TEMPERATURE OF THE ALKALI META AMALGAM ENTERING THE SAME, THE IMPROVEMENT WHICH COMPRISES TRANSFERRING HEAT FROM THE HOT MERCURY WHICH HAS LEFT SAID VESSEL TO THE COLD AMALGAM ENTERING SAID VESSEL THROUGH THE MEDIUM OF AN AQUEOUS FLUID WHICH IS SUCCESSIVELY BROUGHT INTO DIRECT HEAT TRANSFER RELATIONSHIP WIT BOTH THE HOT MERCURY WHICH HAS LEFT SAID VESSEL AND THE COLD AMALGAM ENTERING SAID VESSEL, SAID WATER BEING SEPARATED FROM SAID MERCURY PRIOR TO SAID ELECTROLYZING STAGE.
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) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |