Abstract: A door system used in a doorway of a pressurizable compartment of a high temperature structure, having a screw for compressing the door and a thrust collar providing clearance between the thrust collar and a bearing member during decompression of the door such that in the event the pressurizable compartment is pressurized, the pressure is relieved through the doorway while the door remains in contact with the doorway. The screw includes a shoulder, and the thrust collar is carried on the screw between the shoulder and the bearing member. The collar is configured to bear against the bearing member and the shoulder upon compression of the door. A debris guard covers and protects the screw during advancement and retraction of the screw, and a door frame is provided having weld slots for facilitating welding of the door frame to the high temperature structure.

Abstract: A method and apparatus to perform a signaling protocol between a base station and a remote handset of a digital cordless telephone to simplify the digital cordless telephone. A pseudo-noise (PN) code correlation detector of a direct sequence spread spectrum (DS/SS) module, included in a base station and a remote handset, detects an inverted correlation state in a received digital signal when an strong inverted direct current (DC) content is sensed in the received digital signal. This is indicative that an inverted code sequence was sent in the received digital signal. By pulse-keying the inverted correlation state, commands may be encoded to implement a simplified cordless signaling protocol. For the base station, the two commands encoded are a ‘Flash’ and a ‘On-hook/Off-hook’ toggle. For the remote handset, the two command encoded are a ‘Ring’ and a ‘Page/Find’.