...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 8166722 | Modular floor tile system with transition edge The present invention provides a modular flooring system including a ramp to facilitate entry and exit from the flooring system. The ramp may be modular and interconnect with all or parts of a perimeter of the flooring system, and the ramp may also interconnect with... | 05/01/2012 |
| 7299592 | Structural support system for floor tiles An improved support system for an injection molded floor tile is provided by vertically aligning the support system below the main floor panel with a surface structure above the main floor panel. The surface structure is at least one vertical structure or protuberan... | 11/27/2007 |
| 7114298 | Roll-up floor tile system and method A plurality of interlocking tile pieces form a generally flat traffic-carrying surface. The tile are locked together in a manner to form a plurality of non-bendable tile joints. The tile includes a hinge or fold line along a first axis and a hinge or fold line along... | 10/03/2006 |
| 6802159 | Roll-up floor tile system and the method A plurality of interlocking tile pieces form a generally flat traffic-carrying surface. The tile are locked together in a manner to form a plurality of non-bendable tile joints. The tile includes a hinge or fold line along a first axis and a hinge or fold line along... | 10/12/2004 |