Void-containing Component Has A Continuous Matrix Of Fibers Only (e.g., Porous Paper, Etc.) (428/311.1) Patents (Class 428/FOR112)

Foreign Patent Art Collections

And a force disintegratable component (e.g., stencil sheet, etc.) (428/311.3) (Class 428/FOR113)
Fibers of defined composition (428/311.5) (Class 428/FOR114)

There are no patents to show for this class.