A stable xanthan solution with superior filterability and subterranean injectivity characteristics comprising biopolymer and a chelating agent selected from aliphatic alpha-hydroxy acids having from about 2-7 carbon atoms; aliphatic and aromatic beta-keto compounds having from about 4-9 carbon atoms; or 2- and 4-pyrones having a hydroxyl group alpha to the carbonyl and having 5 or 6 carbon atoms; ...

UHF plasmatron for production of finely divided powder, which contains a coaxial line connected to an energy source and two radial lines 5. The one common conductor of the radial lines 5 consists of a disk 6, which is connected to the central conductor 3 of the coaxial line. The other two conductors of the radial lines 5 are comprised of the respective end surfaces of a cylinder 7, which surrounds...

Method for the production of mixed gas, along with a gasometer for the operation of the technique. The gasometer has first and second rooms (12, 13) which can change their respective volumes and are separated by a movable partition (11). This partition is thus best made as an inner container which partitions one of the relevant rooms. Those gases which are to be mixed are supplied alternately from...

Vulcanisable rubber shock based on diene rubber contains 5-68 wt.%, based on the diene rubber, oxidised oligomer derived from thermally decomposed rubber materials. The oligomer has mol. wt. 450-86000. - The rubber when vulcanised is strong and has good vibration damping properties and is used for damping pads for machines.

An interior apparatus for flash welding of pipes end to end and comprising an extended support element 3, which carries an axially movable jaw arrangement 6 with electrode jaws 35 for clamping of a pipe being welded, an axially immovable jaw arrangement 5 with electrode jaws 26 for clamping of the other pipe, and a toroidal welding transformer. The axially immovable jaw arrangement 5 is mounted on...

Layout for production of finely divided powder, which contains a UHF plasmatron with a coaxial line and a discharge chamber, also a unit 10 for feeding in the starting material, also a reaction container 11, also filters 12 and a powder collection container 13. The reaction container 11 has the shape of a truncated cone, whose upper base surface is arranged to support the plasmatron and the filter...