US3865728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Algicidal surface
Assignee: Dow Silicones Corp
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Filing: 1974-02-25
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Granted: 1975-02-11
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Expires: 1994-02-25
Abstract
Abstract The growth of algae can be retarded or prevented by bringing the algae in contact with a surface which is coated with an organosilicon compound of the unit formula The method is particularly useful for preventing the growth of algae in aquariums by passing the aquarium water through a porous filter, the filter elements of which are coated with the siloxane. Specifically by continuously passing water of a household aquarium through a polyester filter, the filter element of which has been coated with the siloxane BUILD UP OF ALGAE IN THE AQUARIUM IS PREVENTED FOR AN EXTENDED PERIOD OF TIME.
Inventors
- 👤 Eugene A Abbott
- 👤 Alan J Isquith
- 👤 Patrick A Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:50
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
99 words
A FILTER FOR AN AQUARIUM CONSISTING ESSENTIALLY OF A FIRBROUS MATERIAL HAVING BONDED THERETO A COATING CONSISTING ESSENTIALLY OF AN ALGICIDAL AMOUNT OF AN ORGANOSILICON COMPOUND OF THE UNIT FORMULA Y-R"N+(ME3-A)(R''SIRNO3-N/2)A IN WHICH Y IS CHLORINE OR BROMINE, R" IS THE METHYL RADICAL OR AN ALIPHATIC HYDROCARBON RADICAL OF 11 TO 22 CARBON ATOMS, R'' IS A DIVALENT HYDROCARBON RADICAL OF ONE TO 10 CARBON ATOMS, R IS A MONOVALENT HYDROCARBON RADICAL OF ONE TO 6 CARBON ATOMS OR THE CF3CH2CH2- RADICAL, N IS AN INTEGER FROM 0 TO 2, AND A IS AN INTEGER FROM 1 TO 2.
Claim 2
Dependent Claim
99 words
A FILTER FOR AN AQUARIUM CONSISTING ESSENTIALLY OF A FIRBROUS MATERIAL HAVING BONDED THERETO A COATING CONSISTING ESSENTIALLY OF AN ALGICIDAL AMOUNT OF AN ORGANOSILICON COMPOUND OF THE UNIT FORMULA Y-R"N+(ME3-A)(R''SIRNO3-N/2)A IN WHICH Y IS CHLORINE OR BROMINE, R" IS THE METHYL RADICAL OR AN ALIPHATIC HYDROCARBON RADICAL OF 11 TO 22 CARBON ATOMS, R'' IS A DIVALENT HYDROCARBON RADICAL OF ONE TO 10 CARBON ATOMS, R IS A MONOVALENT HYDROCARBON RADICAL OF ONE TO 6 CARBON ATOMS OR THE CF3CH2CH2- RADICAL, N IS AN INTEGER FROM 0 TO 2, AND A IS AN INTEGER FROM 1 TO 2.
Claim 3
Dependent Claim
19 words
A filter in accordance with claim 1 in which the siloxane is of the unit formula Cl C18H37Me2N (CH2)3SiO1.5.
Claim 4
Dependent Claim
12 words
The filter of claim 1 in which the fibrouS material is polyester.
Claim 5
Dependent Claim
13 words
The filter of claim 1 in which the fibrous material is cellulose acetate.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |