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:
Feb. 18, 1992
Filed:
Sep. 24, 1990
Jean-Claude Parent, Garches, FR;
Marie-Helene Renaudin, Paris, FR;
Abstract
Process for preparing disilane, wherein a raw gas including monosilane, disilane, trisilane and impurities such as phosphine, hydrogen sulfide, arsine, disiloxane and higher siloxanes, undergoes a step of separation by distillation for the substantial elimination of the other compounds of silicon, except disiloxane, and the substantial elimination of phosphine, hydrogen sulfide and arsine impurities, wherein a final purification of the disilane takes place by selective adsorption on molecular sieves, in which one is a sieve of type 3 A and which is used for the elimination of the siloxanes and hydrogen sulfide and the other is a sieve of type 4 A for the elimination of phosphine and arsine.