US3620944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifying water by irradiating it
Assignee: Osaka Prefectural Government
•
Filing: 1968-03-12
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Granted: 1971-11-16
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Expires: 1988-03-12
Abstract
Abstract A process for purifying polluted water by irradiating it with ionizing radiation. Water polluted with parathion, phenyl mercuric acetate or methyl mercuric chloride can be purified by irradiating it with ionizing radiation. The amount of irradiations required depends upon the concentration of polluted water to be purified. It is required about 1,000,000 rads to reduce such a high concentration of polluted water as industrial waste water; about 100,000 to 500,000 rads to reduce a medium concentration of polluted water such as sewerage; about 5,000 to 50,000 rads to reduce a low concentration of polluted water such as drinking water.
Inventors
- 👤 Keiko Tanito
- 👤 Norio Kato
- 👤 Shosaku Kinoshita
- 👤 Masahiro Kinoshita
- 👤 Tsuyoshi Sunada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:39
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/30; C02F1/307; C02F2101/00; C02F2101/10; C02F2101/12; C02F2101/20; C02F2101/30; C02F2101/306; C02F2101/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
14 words
A process as claimed in claim 1 in which water is polluted with parathion.
Claim 2
Dependent Claim
16 words
A process as claimed in claim 1 in which water is polluted with phenyl mercuric acetate.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1 in which water is polluted with methyl mercuric chloride.
Claim 4
Dependent Claim
29 words
A process in accordance with claim 1 which further includes the additional step of removing the substances resulting from irradiation of said water by sedimenting and filtering the sediments.
Claim 5
Dependent Claim
25 words
A process in accordance with claim 1 wherein said ionizing radiations are selected from the group consisting of gamma rays, X-rays, and accelerated electron beams.
Claim 6
Dependent Claim
22 words
A process in accordance with claim 1 wherein said dosage of ionizing radiation is in an amount of from about 5,000-1,000,000 rads.
References Cited (Backward Citations)
US3147213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |