The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 29, 1981
Filed:
Oct. 04, 1979
Alain Regnault, Ornex, FR;
Jean-Pierre Sachetto, St-Julien-en Genevois, FR;
Herve Tournier, Valleiry, FR;
Thomas Hamm, Le Lignon, CH;
Jean-Michel Armanet, Onex, CH;
Battelle Memorial Institute, Carouge, CH;
Abstract
A fragmented material is dissolved continuously by impregnation and immersion into a solvent bath in which said material is subjected to a moderate mixing movement allowing it to be kept within the interior of said bath to undergo dissolution therein until formation of fine residual particles of insoluble material which are maintained in suspension by this movement, the whole being removed continuously by a controlled overflow of the bath. This process is applied to cellulose contained in various lignocellulosic materials, which is dissolved continuously by immersion of the previously impregnated material into a bath of hydrochloric acid through which hydrogen chloride gas is caused to bubble, to effect complete dissolution of the cellulose and suspension of the fine insoluble residual lignin particles.