US3759784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bleaching pulp with an aqueous chlorine solution while suppressing vaporization of liquid chlorine
Assignee: OCCIDENTIAL ELECTROCHEMICALS Corp
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Filing: 1970-10-29
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Granted: 1973-09-18
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Expires: 1990-10-29
Abstract
Abstract METHOD FOR BLEACHING PULP WITH A SOLUTION OF A SOLUBLE LIQUEFIED GAS IN A LIQUID CHLORINE SOLVENT WHILE PERMITTING AT LEAST SUBSTANTIALLY FULL PRESSURE ON THE LIQUIFIED GAS TO THE POINT OF INCIPIENT SOLUTION AND THEREAFTER DESIRABLE DISPERSION OF THE LIQUIFIED GAS DISSOLVING THE SOLVENT AS WELL AS PROVIDING FAST AND EFFICIENT FLOW OF THE RESULTING SOLVENT INTO A LIQUID PROCESSING MEDIUM. THE METHOD PROVIDES FOR SUPPRESSED VAPORIZATION OF GAS, EVEN THOUGH SUCH SUPPRESSION OCCURS DURING AN ACCOMPANYING PRESSURE DROP, WHEN THE LIQUEFIED GAS DISSOLVES IN THE SOLVENT, AND FURTHER WHEN THE RESULTING SOLUTION DISPERSES IN THE LIQUID PROCESSING MEDIUM.
Inventors
- 👤 U Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:06
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/12; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87676
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |