Abstract: This specification discloses a means for providing a barrier against the passage of fire through that portion of a wall aperture surrounding an electrical conduit, pipe, or the like. This is accomplished by placing a sleeve around that portion of the conduit passing through the wall, which sleeve is the central portion of an envelope which is anchored peripherally to the wall or to a more or less rigid material blocking the aperture through the wall and which sleeve connects to end portions of the envelope, each of which end portions extends to connect with the conduit on an opposite side of the wall. The annular region between the conduit and the surrounding envelope is filled with an intumescent gel. The boot is flexible and capable of some movement to compensate for thermal expansion, vibration or other forces during the life of the installation.

Abstract: A silicate cement composition consisting of a spray dried hydrated sodium silicate powder and a silica polymer-forming agent includes an adhesive agent in the form of urea and sodium acetate which exhibits optimum adhesion to glass, metal, ceramics, wood and portland cement.

Abstract: A permanently attached artificial limb comprises an endoprosthesis in combination with an artificial tendon attachment. The artificial tendon attachment permits the use of existing skeletal muscles to power external articulating mechanical joints of the endoprosthesis device. The artificial tendon penetrates the skin and provides a strong interface with existing skeletal muscles.

Abstract: A cement composition consisting of the product of a mixture of spray-dried hydrated silicate powder, a silica polymer-forming agent and water. The resulting inorganic silica polymer cement is capable of withstanding sustained exposure to high temperatures without loss of desirable mechanical properties and has a high degree of adhesive as well as compressive strength together with rapid room temperature curing characteristics. A siliceous filler may be added. In addition, a fluoride or halide fixation agent may be added so that the resulting cement product may resist higher temperatures.

Abstract: A hydrothermal cement composition consisting essentially of (a) a polyvalent metal ion source, (b) water, and (c) a hydratable silica source wherein the silica becomes available for chemical combination with the polyvalent metal salt upon application of heat. A method of cementing a string of pipe in a bore hole including the steps of preparing such a cement composition, pumping the cement composition into the annular space between the string of pipe and the walls of the bore hole, and allowing the cement to set due to the temperature of the bore hole or by passage of time or both.