Patent ID: 8492660

Claim:
A radio-frequency shielded door system, comprising: a door frame attachable to an opening in a radio frequency (RF) shielded enclosure; a door, attachable to said door frame, to allow passage into and out of said RF shielded enclosure through a passageway; a fixed, RF shielded threshold attachable to said door frame, for placement between a floor and said opening, where a height of said threshold does not exceed ¼; a bladder for placement between the door and door frame; an electrically conductive material for completely covering the bladder and between the bladder and door frame; and a subsystem operable to inflate or deflate said bladder, wherein an inflated bladder contacts said conductive material which in turn contacts said door frame when said door is in a closed position, wherein the subsystem is further operable to inflate said bladder to an air pressure of 15 psi.