Abstract: There is disclosed a method for purifying a used aqueous N-methylmorpholine N-oxide solution reclaimed from a spinning aqueous solution, which results from a coagulation solution into which a cellulose dope containing N-methylmorpholine N-oxide is extruded through a spinning die and from a washing solution for the coagulated cellulosic articles in manufacture processes for cellulose fibers or films, comprising adding an oxidant to the used aqueous N-methylmorpholine N-oxide solution to remove impurities therefrom through oxidation N-methylmorpholine into N-methylmorpholine N-oxide and break down of the chromophores of the impurities. Utterly distinguished from, conventional methods in the principle, the method is very simple and efficient as well as far superior to the conventional methods using ion exchange resin in the decoloration. In addition, it needs not suffer a loss of amine oxide as usual in the ion exchange resin.

Abstract: This specification discloses pelletized pre-dope granules of cellulose and a tertiary amine oxide wherein the tertiary amine oxide is homogeneously dispersed throughout the cellulose and a process for making them. According to the invention, the pelletized pre-dope granules can be prepared by a process comprising of the steps of feeding cellulose to a mill with knife-edged blades, together with the tertiary amine oxide powder having a water content of 5 to 17% by weight; and milling and blending the resulting solid mixture in the blender, while heating the solid mixture at a temperature sufficient to agglomerate as a result of instantaneous melting of tertiary amine oxide powder and simultaneous penetration of the molten amine oxide into cellulose without dissolving the cellulose. The pre-dope granules thus obtained can be used in making shaped cellulosic articles such as fibers and films.

Abstract: A compact module for receiving teletext data contained in a composite video signal is usable with a personal computer or a videotex decoder system. The module includes a data selector for separating teletext data from the video signal, a receiver for checking data transmission errors and comparing the addresses of received data with preselected addresses of specific data requested by a user. The module also includes a cental processing unit for processing the data produced by the receiver, which is then transmitted to the personal computer or videotex system through an input/output interface, to be displayed.

Abstract: A direct memory access control device as a part of a teletext adaptor is equipped with a data separating element, a data receiving element including an improved direct memory access control device as a part, and a data processing element. The direct memory access control device comprises a serial/parallel convertor, a D-flip flop, an OR gate, a byte synchronization detector, a multivibrator, a 4 division counter, a 8 division counter, a 64 division counter, a RAM, a multiplexer and so forth. The teletext data can be stored in RAM. During an interval between the remaining video signal periods, the microprocessor can process signals so that all the elements may be simplified and the cost entailed therefore may be lowered accordingly.