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Grid plate

  • US 5,287,649 A
  • Filed: 06/05/1992
  • Issued: 02/22/1994
  • Est. Priority Date: 06/07/1991
  • Status: Expired due to Term
First Claim
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1. A grid plate comprising a base and vertical side walls integral to the base which form chambers open to the top, the bottom of each chamber being provided with a drainage hole and the base having projections on a plate rim which protrude beyond the plate rim and grip the base area of an adjacent grid plate, the plate rim of the grid plate intersecting the rim-bordering side walls of at least every second rim-bordering chamber to form intersected laterally open chambers, the intersected laterally open chambers being completed by rim-bordering side walls of adjacent grid plates to additional laterally closed chambers, the rim-bordering side walls of adjacent grid plates being in contact only along vertical edges of the side walls intersected by the plate rim.

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