Easy Lid / Jam the lid

The lids of the jam jars, on the other hands, are in many cases tightly stuck because of the sugar in it.
The design we suggest here is to make the lid open with various tools we can easily find in the kitchen.
There are grooves on the lid, so that the users may put their butter knives or jam knives into the groove and turn the lid to the opening direction. In this way, even users without considerable strength may easily open the stuck lids