The panels are mounted on a support surface, such as a wall or roof, in a plurality of vertically spaced horizontal courses with a lower marginal edge...http://www.google.com/patents/US5249402?utm_source=gb-gplus-sharePatent US5249402 - Decorative wall coveringAdvanced Patent SearchPublication numberUS5249402 APublication typeGrantApplication numberUS 07/682,672Publication dateOct 5, 1993Filing da