Abstract: Methods, apparatus, and products are disclosed for electronic coupon validation for a Point Of Sale (‘POS’) transaction that include: maintaining, by a POS module, a product coupon participation table that associates each of a plurality of electronic coupons with one or more items which qualify for that electronic coupon; identifying, by the POS module, a plurality of purchase items for a POS transaction; generating, by the POS module, a transaction coupon list in dependence upon the product coupon participation table and the plurality of purchase items; receiving, by the POS module, an electronic customer coupon; determining, by the POS module, whether the electronic customer coupon is specified in the transaction coupon list; and applying, by the POS module, the electronic customer coupon to the POS transaction if the electronic customer coupon is specified in the transaction coupon list.

Abstract: An improved OBS based technique that monitors gas emissions from smoke stacks, tail pipes, and other sources, and that separates gas column density from thermal radiance contrast. The technique of the present invention utilizes a software generated digital filter (30) constructed to correlate with only the spectrum of gas (12) of interest, and have zero correlation with background components (22). Through using the improved OBS technique of the present invention, high performance and more positive cost effective gas monitoring systems and sensors may be built and implemented.