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| Number | Title | Issue Date |
| 4610809 | Doped lignin polymer A polymer that has been made of lignen and that contains sulphur, and into which a compound that activates the conductivity, such as iodine or ferric chloride, has been doped. The doped lignin polymer has properties of a semiconductor.... | 09/09/1986 |
| 4481074 | Process for the preparation of a sodium sulphite containing liquor The method relates to a process in the preparation of the cooking liquor for sodium sulphite pulp for carrying out a reaction between sodium bisulphite and sodium bicarbonate and/or sodium carbonate by bringing solutions containing said compounds into con... | 11/06/1984 |
| 4107111 | Polymer made of lignin, and method for making it This invention relates to a three-dimensional, aromatic, sulfur-containing polymer based on lignin. The polymer is characterized in that it is amorphous, practically insoluble in water and conventional organic solvents; it contains thioether bonds and pos... | 08/15/1978 |
| 4009088 | Process for producing aqueous solutions of sodium, ammonium and magnesium sulphite A continuously operative electrochemical ion exchange process for producing sodium, ammonium or magnesium sulphite or hydrogen sulphite in an aqueous solution simultaneously with the production of a useful calcium salt as a by-product by subjecting an aqu... | 02/22/1977 |
