Fail-safe water purifying apparatus
Abstract
Abstract Apparatus for the purification of liquid, such as water, by exposing the same to ultraviolet lamp, embodying means forming an annular passageway through which water may flow in surrounding relation to an electric lamp of a type producing ultraviolet light and ultraviolet light-responsive means for shutting off the flow of water therethrough in response to a decrease in the intensity of the ultraviolet light passing through the water when such intensity falls below a predetermined value. The apparatus includes a protective tube of quartz glass surrounding the ultraviolet lamp and wiper means movable in response to the turning off and on of the flow of water through the apparatus to wipe the external surface of the quartz tube. Means is also provided for preventing the formation of clouded areas on the glass of the lamp due to the positioning of the wiper means at one location surrounding the lamp during long periods of nonoperation of the wiper means while the lamp is on. Means is provided for preventing the wiper means from interferring with the flow of ultraviolet light flowing to the light responsive means by which the flow of water is cut off.
Inventors
- 👤 Ralph W Hippen
Bibliographic Details
Claims Analysis
Total Claims: 1References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |