US4069153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of destroying pyrogens
Assignee: American Sterilizer Co
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Filing: 1976-11-04
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Granted: 1978-01-17
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Expires: 1996-11-04
Abstract
Abstract A method of providing a continuous available supply of physiologically safe water for use in fluid therapy by providing a sub-micron filter to remove bacteria at the source, and by continuously treating the water with ultraviolet light at a frequency range and dosage sufficient to destroy substantially all pyrogenicity and organisms, such as viruses, that are not retained by the filter.
Inventors
- 👤 Donald A. Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:01
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/30; C02F1/32; C02F1/325; A; A61; A61L; A61L2/00; A61L2/02; A61L2/08; A61L2/10; C02F2103/00; C02F2103/02; C02F2103/026; C02F2201/00; C02F2201/32; C02F2201/322; C02F2201/3223; C02F2201/3227; C02F2201/3228; C02F2303/00; C02F2303/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
A method of providing a continuous flow of physiologically safe water comprising, providing a continuous flow of water containing lipopolysaccharides known as pyrogens, treating said water containing said lipopolysaccharides with ultra-violet light of a wave length and dosage sufficient to chemically alter substantially all pyrogens in said water to destroy substantially all pyrogenicity of said water, said ultra-violet light being of a wave length of 1800A to 2000A at a dosage in the order of 100,000 to 300,000 microwatt-seconds per square centimeter of area of said flow path, with all said water flowing within 6 millimeters of said light, thereby converting a substantial amount of oxygen dissolved in said water to ozone, and whereby said pyrogen destruction is enhanced and substantially all pyrogenicity of said water is destroyed and said water is safe for physiological use.
Claim 2
Independent Claim
136 words
A method of providing a continuous flow of physiologically safe water comprising, providing a continuous flow of water containing lipopolysaccharides known as pyrogens, treating said water containing said lipopolysaccharides with ultra-violet light of a wave length and dosage sufficient to chemically alter substantially all pyrogens in said water to destroy substantially all pyrogenicity of said water, said ultra-violet light being of a wave length of 1800A to 2000A at a dosage in the order of 100,000 to 300,000 microwatt-seconds per square centimeter of area of said flow path, with all said water flowing within 6 millimeters of said light, thereby converting a substantial amount of oxygen dissolved in said water to ozone, and whereby said pyrogen destruction is enhanced and substantially all pyrogenicity of said water is destroyed and said water is safe for physiological use.
Claim 3
Dependent Claim
29 words
The method of treating water recited in claim 1 wherein said water contains filterable bacteria and is filtered through a bacteria-retentive filter prior to treatment with said ultra-violet light.
References Cited (Backward Citations)
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Cited
US3336099A
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US3672823A
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US3700406A
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US3791790A
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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) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |