Other

Minnesota Mining and Manufacturing Company

Peter B Fleming

Joseph C Peisert

Richard R Licht

Theodore F Bolles

Penetrations or passageways through fire resistant walls, floors, partitions and ceilings are frequently necessary to provide for present or future pipes, cables or conduits. A device fixed to the walls of the penetration provides a barrier to prevent the passing of fire, heat, smoke and toxic gases, and water through the penetration under adverse conditions of fire or elevated temperatures. The device includes at least one end cap capable of providing a cold smoke seal. An intumescent material which in the event of excessive heat or fire, foams and expands to substantially fill the penetration, is provided. The device may include a laminated restraining layer to provide assurance that the char formed during the intumescent reaction to fire and heat, is generated so that the penetration cavity is optimally filled.

Fire barrier device

An optically transparent, essentially colorless radiation shielding material for high energy radiation contains a combination of lead or thallium salts of C.sub.1 to C.sub.5 organic acids and may contain lead or thallium salts of mineral acids. Shields of complex shapes are easily constructed.

Growing community of inventors

Woodbury, MN, United States of America

Peter B Fleming