Petri dish having two-position lid
Patent 5520302 Issued on May 28, 1996. Estimated Expiration Date: 
January 27, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 27, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3055808 3234107 3632478 3649463 3769171 Biological chamber apparatus Petri dish Method and container for growth of anaerobic microorganisms Plant culture vessel Growth container and method for pathogenic and other laboratory organisms InventorsApplicationNo. 189153 filed on 01/27/1994US Classes:220/800, Juncture internal of passage mouth (e.g., stopper type closure)206/507, By selective orientation of superposed receptacles220/366.1, Vent at closure, closure support juncture220/802, And includes closure flange embracing closure support outer wall220/803, With gasket or packing435/299.1Including solid extended fluid contact reaction surfaceExaminersPrimary: Shoap, Allan N.Assistant: Newhouse, Nathan J. Attorney, Agent or FirmInternational ClassesB65D 051/16B65D 021/06 C12M 001/22 AbstractA petri dish for the culturing of microorganisms includes a rectangular dish having a floor plate and an endless peripheral dish wall which extends upwardly therefrom, and a two-position lid. The lid includes a ceiling plate, an endless outer peripheral lid wall extending downwardly therefrom, and an endless groove generally adjacent to the outer peripheral lid wall, which corresponds in shape to an upward end of the dish wall. When the lid is oriented in a first position entirely overlying the dish, the upward end of the dish wall is prevented from being fully inserted into the groove so that gas flow is permitted between the lid and the dish. When the lid is turned 180 degrees and placed in a second position entirely overlying the dish, the upward end of the dish wall extends into the groove. This has the effect of severely restricting or preventing gas flow between the lid and the dish. Beads and flanges are integrally molded onto exterior surfaces of the lid and dish to facilitate the stacking of petri dishes one atop another, and handling of the components. |
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