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:
Nov. 20, 1984
Filed:
Apr. 05, 1984
Tibor F Devenyi, Nepean, CA;
Iwona Turlik, Nepean, CA;
Northern Telecom Limited, Montreal, CA;
Abstract
During production of laser diodes, crystals on which the laser diodes are formed are subjected to two high temperature processes: diffusion and alloying. These steps are performed in a quartz process tube in an oxygen free atmosphere. At some stage in the process the crystal must be moved from a cool zone to a hot zone within the tube and this is done by means of a push rod which extends through an aperture in the diffusion tube. The conventional arrangement for sealing around the push rod acts to clamp the push rod in position. Thus, temporarily, while the push rod is being moved the seal must be partly released and its sealing action is inferior. To maintain the process atomsphere free of reactive gas there is proposed by the invention a mechanism for flooding the sealing area between the push rod and the process tube with an inert gas while the sealing means is temporarily released.