US Patent 7536802 Low-obscuring tile installation spacer

The disclosure relates to tile-spacing devices for spacing tiles apart from one another during their installation, so as to create a space between the tiles, such as a space into which a grout, mortar, sealant, or other material can be inserted. Like previous tile-spacing devices, the devices described herein include one or more spacers disposed on a base. However, unlike previous devices, the devices described herein have a window that extends through the base, through which engagement of at least one of the tiles with the edge of a spacer can be visually observed.