US3633546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Algae growth-preventing container
Assignee: National Patent Development Corp
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Filing: 1970-04-21
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Granted: 1972-01-11
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Expires: 1990-04-21
Abstract
Abstract A container for water in which vertebrate animals swim is given an internal coating of a hydrophilic polymer having an algicide impregnated or adsorbed therein. This prevents the algae from growing on the container and is especially valuable in preserving the transparency of glass or clear plastic aquariums.
Inventors
- 👤 Alvin Guttag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:39
CPC Classifications
A; A01; A01K; A01K63/00; A01K63/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
10 words
A container according to claim 1 which is an aquarium.
Claim 2
Dependent Claim
33 words
An aquarium according to claim 2 wherein the wall means includes a plurality of generally upright sides, at least one of which is transparent, said algicide impregnated hydrophilic polymer covering said transparent side.
Claim 3
Dependent Claim
30 words
An aquarium according to claim 3 which is rectangular in plan and has four generally upright, transparent sides, all of which have a coating of said algicide impregnated hydrophilic polymer.
Claim 4
Dependent Claim
19 words
An aquarium according to claim 2 wherein said polymer coating is a hydrophilic water insoluble, water swellable acrylic resin.
Claim 5
Dependent Claim
31 words
An aquarium according to claim 5 wherein said polymer is a polymer of a hydrophilic hydroxyalkyl or hydroxyalkoxyalkyl acrylate or methacrylate or acrylamide, alkyl acrylamide, methacrylamide, alkyl methacrylamide or diacetone acrylamide.
Claim 6
Dependent Claim
22 words
An aquarium according to claim 6 wherein the coating comprises a polymer of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate or hydroxypropyl methacrylate.
Claim 7
Dependent Claim
17 words
A container according to claim 2 having water therein and adapted to contain fish in the water.
Claim 8
Dependent Claim
24 words
A container according to claim 1 wherein said algae growth-preventing means covers the entire internal surface of the transparent portion of the wall means.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |