In one application, the structural element is a removable door frame having a molded-in channel which opens downwardly and is disposed...http://www.google.com/patents/US5947546?utm_source=gb-gplus-sharePatent US5947546 - Apparatus for attaching a soft top to a motor vehicleAdvanced Patent SearchPublication numberUS5947546 APublication typeGrantApplication numberUS 08/955,959Publication dateSep 7,