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:
Jul. 27, 1993
Filed:
Jun. 24, 1991
Toshimitsu Ohmine, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A gas-phase growing apparatus is provided with a reaction furnace, and a substrate having a minute depression is placed inside the reaction furnace. In the reaction furnace, a reaction gas is supplied onto the substrate, so as to cause gas-phase growth of a layer of a reaction product within the depression of the substrate. The reaction gas is supplied such that the pressure in the reaction furnace is alternately changed between a first pressure and a second pressure. The first pressure is a pressure capable of producing a continuous or intermediate stream in which the collision between the molecules of the reaction gas is predominant, while the second pressure is a pressure lower than the first pressure. The gas-phase growing apparatus is also provided with a pipe for introducing the reaction gas into the reaction furnace, a valve for controlling the flow rate of the reaction gas, a pump for discharging the unconverted reaction gas from the reaction furnace, an orifice for providing flow resistance for the discharge side of the reaction furnace, a pressure meter for measuring the internal pressure of the reaction furnace, and an electromagnetic valve operating in association with the pressure meter.