US2965445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying alkali metal hydroxide and alkali metal halide solutions
Assignee: Diamond Shamrock Corp
•
Filing: 1959-02-09
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Granted: 1960-12-20
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Expires: 1979-02-09
Abstract
No abstract record available.
Inventors
- 👤 Duane N Goens
- 👤 Duc Joseph Adrien M Le
- 👤 Jr Christopher C Silsby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:15
CPC Classifications
C; C01; C01D; C01D3/00; C01D3/14; C01D1/00; C01D1/04; C01D1/28; Y; Y10; Y10S; Y10S159/00; Y10S159/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A METHOD OF TREATING AQUEOUS SOLUTIONS OF ALKALI METAL HYDROXIDES AND ALKALI METAL HALIDES SO AS TO REMOVE THEREFROM FLUORESCENCE OR FINELY-DIVIED SOLID MATTER WHICH COMPRISES CONTACTING SAID AQUEOUS SOLUTIONS WITH FINELY-DIVIDED POLYETHYLENE FOR A PERIOD OF TIME SUFFI-
Claim 2
Independent Claim
39 words
A METHOD OF TREATING AQUEOUS SOLUTIONS OF ALKALI METAL HYDROXIDES AND ALKALI METAL HALIDES SO AS TO REMOVE THEREFROM FLUORESCENCE OR FINELY-DIVIED SOLID MATTER WHICH COMPRISES CONTACTING SAID AQUEOUS SOLUTIONS WITH FINELY-DIVIDED POLYETHYLENE FOR A PERIOD OF TIME SUFFI-
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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |