Multilayer seal has central aperture, top layer of seal having section which is bent back around its periphery and lower layer having similar section which is gripped by first section

摘要

The multilayer seal has a central aperture (120). The top layer (104) has a section (125) which is bent back around its periphery. The lower layer (102) has a similar section (128) which is gripped by the first section. An Independent claim is included for a method for connecting the layers of a multilayer seal.