US2580809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Procedure for purifying aqueous liquid
Assignee: US Filter Wallace and Tiernan Inc
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Filing: 1949-06-14
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Granted: 1952-01-01
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Expires: 1969-06-14
Abstract
No abstract record available.
Inventors
- 👤 Henry C Marks
- 👤 Strandskov Frede Bernhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:26
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/766; C02F1/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
PROCEDURE FOR TREATING AQUEOUS LIQUID WHICH MAY HAVE A CONTAMINATING ORGANIC CONTENT, TO PROVIDE A PROLONGED STERILIZING EFFECT IN SAID LIQUID, COMPRISING ESTABLISHING IN THE LIQUID A CONTENT OF A HALOGEN OF GREATER ATOMIC WEIGHT THAN CHLORINE, IN AVAILABLE FORM TO PROVIDE AN APPRECIABLE STERILIZING EFFECT, A PART OF SAID HALOGEN BEING THEN REDUCED TO HALIDE BY ORGANIC CONTENT OF THE LIQUID, AND CONTINUING STERILIZING ACTION IN THE LIQUID AND RE-ESTABLISHING SAID CONTENT OF SAID AVAILABLE HALOGEN FOR FURTHER STERILIZING EFFECT, BY INTRODUCING OZONE IN THE LIQUID IN AMOUNT SUFFICIENT TO CONVERT AT LEAST AN APPRECIABLE PART OF THE AFORESAID HALIDE INTO AVAILABLE HALOGEN, SAID FIRST-MENTIONED STEP OF ESTABLISHING A HALOGEN CONTENT INCLUDING SUPPLYING HALOGEN MATERIAL IN AMOUNT TO ADD AT LEAST ABOUT 0.2 P.P.M. OF SAID HALOGEN TO THE LIQUID, AND SAID PROCEDURE OF ESTABLISHING A HALOGEN CONTENT AND TREATING WITH OZONE PROVIDING NOT MORE THAN ABOUT 100 P.P.M. RESIDUAL CONTENT OF SAID HALOGEN IN AVAILABLE FORM IN THE LIQUID.
Claim 2
Dependent Claim
161 words
PROCEDURE FOR TREATING AQUEOUS LIQUID WHICH MAY HAVE A CONTAMINATING ORGANIC CONTENT, TO PROVIDE A PROLONGED STERILIZING EFFECT IN SAID LIQUID, COMPRISING ESTABLISHING IN THE LIQUID A CONTENT OF A HALOGEN OF GREATER ATOMIC WEIGHT THAN CHLORINE, IN AVAILABLE FORM TO PROVIDE AN APPRECIABLE STERILIZING EFFECT, A PART OF SAID HALOGEN BEING THEN REDUCED TO HALIDE BY ORGANIC CONTENT OF THE LIQUID, AND CONTINUING STERILIZING ACTION IN THE LIQUID AND RE-ESTABLISHING SAID CONTENT OF SAID AVAILABLE HALOGEN FOR FURTHER STERILIZING EFFECT, BY INTRODUCING OZONE IN THE LIQUID IN AMOUNT SUFFICIENT TO CONVERT AT LEAST AN APPRECIABLE PART OF THE AFORESAID HALIDE INTO AVAILABLE HALOGEN, SAID FIRST-MENTIONED STEP OF ESTABLISHING A HALOGEN CONTENT INCLUDING SUPPLYING HALOGEN MATERIAL IN AMOUNT TO ADD AT LEAST ABOUT 0.2 P.P.M. OF SAID HALOGEN TO THE LIQUID, AND SAID PROCEDURE OF ESTABLISHING A HALOGEN CONTENT AND TREATING WITH OZONE PROVIDING NOT MORE THAN ABOUT 100 P.P.M. RESIDUAL CONTENT OF SAID HALOGEN IN AVAILABLE FORM IN THE LIQUID.
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) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |