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:
Dec. 23, 1997
Filed:
Feb. 14, 1996
Markus Biebl, Augsburg, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A micromechanical structure is etched on a component that has been introduced into a container having a plurality of inlet and discharge openings. The liquid etchant is displaced downwardly through a liquid discharge at the underside of the container by admitting water through the liquid inlet at the upper side, whereby no turbulence occurs in the liquid flow. The water employed as a rinsing agent is displaced by a liquid having a lower density such as, for example, ethanol or acetone. Finally, a liquefied gas, for example liquid carbon dioxide, is admitted via the liquid, this gas is evaporated by heating the container above the critical temperature, the pressure in the inside of the container is reduced to the ambient air pressure by opening a gas discharge, and the component is removed from the container through a sluice or lock.