Patent ID: 7927564

Claim:
An assembly comprising: a first histological specimen cassette having a first receptacle and a first lid, the first receptacle having a bottom wall, opposite side walls, opposite front and back walls, and a cavity, the cavity being positioned between the sidewalls and between the front and back walls, the cavity being partially bound by the bottom wall, the bottom wall having a plurality of apertures that extend through the bottom wall and that create fluid passageways into the cavity, the first lid having a plurality of apertures that extend through the first lid and that create additional fluid passageways into the cavity, the first lid being movable between an opened position and a closed position relative to the first receptacle, the first lid engaging the first receptacle when the first lid is in the closed position and the cavity being partially bound by the first lid when the first lid is in the closed position; and a second histological specimen cassette having a second receptacle and a second lid, the second receptacle having a bottom wall, opposite side walls, opposite front and back walls, and a cavity, the cavity being positioned between the sidewalls and between the front and back walls, the cavity being partially bound by the bottom wall, the bottom wall having a plurality of apertures that extend through the bottom wall and that create fluid passageways into the cavity, the second lid having a plurality of apertures that extend through the second lid and that create additional fluid passageways into the cavity, the second lid being movable between an opened position and a closed position relative to the second receptacle, the second lid engaging the second receptacle when the second lid is in the closed position and the cavity being partially bound by the second lid when the second lid is in the closed position, wherein the cavity of the second histological specimen cassette has a parallelepiped void that has a length of at least 31.75 millimeters, a width of at least 25.4 millimeters, and a height of at least 5.08 millimeters, wherein the first histological specimen cassette fits entirely within the void of the second histological specimen cassette when the second lid is in the closed position to create an assembly.