Patent ID: 8365919

Claim:
A substrate storage container for storing substrates in a container body, comprising: a pair of conveyor contact rails integrally formed as part of a bottom plate attached to the bottom of the container body, a door element removably fitted with a sealing gasket interposed therebetween so as to open and close an opening of the container body, a front retainer for individually holding the substrates at their front peripheral edge being removably attached to the inner face of the door element, wherein each of the conveyor contact rails has a conveyor contact surface having a bottom that is formed as a smooth, flat plane and a difference between the maximum height and minimum height from a reference surface of the conveyor contact rail is 0.3 mm or smaller, whereby that the conveyor contact rails inhibit vibrations acting on substrates when the container body is transported by a conveyor, wherein the container body is configured of a front-open box type that has a base plate with substrate supporting ribs arranged vertically on both sides therein and support the substrate horizontally; wherein the base plate includes a pair of position restraint members formed on a rear side and an interior side of the base plate where no supporting rib is provided, the base plate having openings at its front and rear sides, and each position restraint member having a connecting portion that is narrower than the openings at the front and rear sides of the base plate, a plurality of projections that will come in area contact within 5 mm from the peripheral part of the undersurface of the substrate are formed on the top surface of each supporting rib so as to extend inwards from the outer side with respect to the width; both the side edges of each projection are inclined so that the projection gradually becomes narrower inwards from the outer side with respect to the width of the container body; the supporting ribs are formed shelf-like for supporting the substrates and are integrally formed with the base plate with a primary side thermoplastic resin; a slip stopper projection is formed in the front end of the supporting ribs while the pair of position restraint members molded with a secondary side thermoplastic resin are provided at the rear portion of the supporting ribs so as to hold the base plate integrally from a front side and an underside, so that the base plate provided with the supporting ribs, the slip stopper projection and the position restraint members is formed integrally with both interior side walls of the container body when the container body is molded with a thermoplastic resin; and each position restraint member is molded, essentially in an elongate plate form, of an abrasion resistant material different from that of the supporting ribs and integrated with the base plate, for regulating the inserted positions of the substrates.