Zuricher; Beuteltuchfabrik Ag

Zuricher Beuteltuchfabrik Aktiengesellschraft

Zucher Beuteltuchfabrik Ag

Hans-Rudolf Muller

A filter medium for cake-forming filtration processes is described, which is characterized in that a filter membrane is embedded on either side in a fabric structure, which assumes a mechanical protective function.

Filter medium for cake-forming filtration processes

An article adapted to be dispensed from aircraft onto large surface areas for the purpose of beneficially influencing the environment which employs a hollow casing having at least one opening whereby when at least one item for producing such influence is stored in the casing, the item will be released through the opening to the adjacent surface areas to initiate the influence on the environment after the casing is in landed position. At least one of the items is disposed in the casing. A structural arrangement is secured to the casing to prevent the casing when in landed position from being in direct contact with the surface area, thus shielding the item from the adverse influence of local weather.

Object for receiving and storing useful means

A casing in the form of cylindrical hollow body is terminated at one end by a base and is optionally provided with a hanger. The other end of the cylindrical hollow body is covered by a cover. The cover has a gauze arranged in a frame. The gauze meshes have a clearly defined cross-sectional surface. Useful organisms are placed in a protected manner in the hollow body and only those useful organisms having a desired size can pass through the gauze. The casing is treated by chemical or physical means so that it will remain intact and the organisms contained therein will be protected for a time period predetermined by such treatment. As the casing is made from non-toxic materials, its decomposition at the end of the intactness period does not adversely effect the environment.

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Zurich, Switzerland

Hans-Rudolf Muller