US4320085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inhibiting and eliminating chlorophyceae in water in tank
Assignee: Marui Industrial Co Ltd
•
Filing: 1980-04-04
•
Granted: 1982-03-16
•
Expires: 2000-04-04
Abstract
Abstract Water stored in a container is circulated through an external passageway and subjected to ultraviolet radiation, whereupon undesired aquatic chlorophyceae are eliminated by inhibiting their growth. The water is circulated at such a rate that at least half the volume of water in the container is circulated per hour.
Inventors
- 👤 Masanobu Takeguchi
- 👤 Isao Oyobe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:43
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/30; C02F1/32; C02F1/325; C02F2201/00; C02F2201/32; C02F2201/322; C02F2201/3223
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A method of inhibiting and eliminating chlorophyceae in water in a tank which comprises: circulating said water through an ultraviolet irradiation vessel equipped with a short-wave ultraviolet lamp at such a rate that at least half of the volume of water in said tank is circulated per hour and that a given volume of water is exposed to at least 170 μW.min/cm 2 of ultra-violet radiation at one pass through said irradiation vessel such that said ultraviolet exposure is insufficient to kill a substantial portion of said chlorophyceae in said one pass and without having a detrimental affect on higher aquatic life forms; exposing said water to a chlorophyceae inhibiting and eliminating agent consisting essentially of ultraviolet radiation, having a predominant wavelength of 253.7 nm, and returning said water to said water tank.
Claim 2
Independent Claim
133 words
A method of inhibiting and eliminating chlorophyceae in water in a tank which comprises: circulating said water through an ultraviolet irradiation vessel equipped with a short-wave ultraviolet lamp at such a rate that at least half of the volume of water in said tank is circulated per hour and that a given volume of water is exposed to at least 170 μW.min/cm 2 of ultra-violet radiation at one pass through said irradiation vessel such that said ultraviolet exposure is insufficient to kill a substantial portion of said chlorophyceae in said one pass and without having a detrimental affect on higher aquatic life forms; exposing said water to a chlorophyceae inhibiting and eliminating agent consisting essentially of ultraviolet radiation, having a predominant wavelength of 253.7 nm, and returning said water to said water tank.
Claim 3
Independent Claim
130 words
A method of inhibiting and eliminating chlorophyceae in water in tank which comprises: circulating said water through an ultra-violet irradiation vessel equipped with a short-wave ultraviolet lamp at such a rate that at least half of the volume of water in said tank is circulated per hour and exposing a given volume of water to a total of at least 1000 μW.min/cm 2 of ultra-violet radiation during a one-hour circulation such that said ultraviolet exposure is insufficient to kill a substantial portion of said chlorophyceae in said one pass and without having a detrimental affect on higher aquatic life forms; exposing said water to a chlorophyceae inhibiting and eliminating agent consisting essentially of ultraviolet radiation having a predominant wavelength of 253.7 nm; and returning said water to said water tank.
Claim 4
Independent Claim
130 words
A method of inhibiting and eliminating chlorophyceae in water in tank which comprises: circulating said water through an ultra-violet irradiation vessel equipped with a short-wave ultraviolet lamp at such a rate that at least half of the volume of water in said tank is circulated per hour and exposing a given volume of water to a total of at least 1000 μW.min/cm 2 of ultra-violet radiation during a one-hour circulation such that said ultraviolet exposure is insufficient to kill a substantial portion of said chlorophyceae in said one pass and without having a detrimental affect on higher aquatic life forms; exposing said water to a chlorophyceae inhibiting and eliminating agent consisting essentially of ultraviolet radiation having a predominant wavelength of 253.7 nm; and returning said water to said water tank.
Claim 5
Independent Claim
24 words
A method according to claims 1 or 2 which further comprises circulating at least twice the volume of water in the tank per hour.
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) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |