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US 4,300,478 AGranted
Aquarium structure
OwnerBennett L. Wiseinventor
Life of this patent
Estimating the term…
Abstract
The aquarium is formed such that the upper extremity of the structure is positioned above its access opening. The access opening is configured such that air may not enter the upper extremity of the aquarium directly and, consequently, atmospheric pressure acting upon the liquid through the access opening maintains the liquid in the aquarium top.
Claims8
An aquarium structure capable of maintaining a liquid therein at a level above an access opening in the aquarium, comprising:
- a bottom portion;
- a top enclosure structure connected to said bottom portion for defining the aquarium interior;
- a side opening formed in said top enclosure and disposed medially between said bottom portion and the top extreme of said enclosure structure, said side opening being formed in a horizontal plane;
- said side opening is formed in said enclosure structure between an outer wall relative to the center of said aquarium and an inner wall relative to the center of said aquarium, said outer wall rising from below the bottom of said inner wall to a height above the bottom of said inner wall, said inner wall extending laterally across the entire top enclosure and acting to block the path of air or other gas from said side opening to the inner top extreme of the aquarium when the aquarium is filled with liquid, and
- liquid disposed within and filling the interior of the aquarium including the top extreme of the enclosure structure above said side opening.
2 more elements
Dependencies are inferred from the claim text.