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:
Jan. 03, 1995
Filed:
May. 22, 1992
Jacques Detaint, Villemonble, FR;
Jacquie Schwartzel, Palaiseau, FR;
Yves Toudic, Lannion, FR;
Etienne Philippot, Saint Mathieu De Trevier, FR;
Bernard Cappelle, Villejuif, FR;
Albert Zarka, Paris, FR;
Aline Goiffon, Saint Clement La Riviere, FR;
Roger Arnaud, Crangevrier, FR;
France Telecom, Paris, FR;
Centre National de la Recherche Scientifique (CNRS), Paris, FR;
Abstract
The present invention relates to a process for increasing the dimensions of quartz crystals and of quartz-isomorphic materials, which can be produced by hydrothermal growth from seed, in which a seed obtained by assembly of several crystalline plates is used, wherein there are assembled at least two plates of strictly identical lengths and/or widths and of similar thicknesses, cut in at least one crystal and having, on at least three faces crystalline orientations, the deviations from which remain, between the plates, smaller than about 10' of arc, and wherein said plates are brought together on a support by guidance elements, thus ensuring their alignment on the aforementioned three faces while maintaining crystalline orientation deviations smaller than about 10' of arc, one face per plate being left free for growth of the assembled seeds, leading to the production of a single crystal exhibiting at least one dimension greater than that corresponding to the original crystalline plate. The subject of this invention is also to the crystals obtained by this process.