A flattened base having a blade holding slot in the upper surface thereof and a steel-rule die type cutting blade mounted therein to protrude sufficiently for cutting through the backing of a pile carpet is configured for placement beneath carpet sections so that two such sections may be to cut to match...http://www.google.com/patents/US5355754?utm_source=gb-gplus-sharePatent US5355754 - Carpet seam cutter
