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. 19, 1991
Filed:
Sep. 04, 1990
Franz Szenger, Konigsbronn, DE;
Carl-Zeiss-Stiftung, Heidenheim/Brenz, Oberkochen, DE;
Abstract
At least one of the surfaces of the glass or glass-ceramic graduated-scale support (12) of a measuring device is drawn toward a corresponding surface of the guide part (11) by the capillary action of a liquid film (13). The graduated-scale support floats without friction on this liquid film and is secured against floating away laterally by low-friction stops (16-18) which can also be formed of the liquid film itself or suitable shaping of graduated-scale support and of the guide part to which it is mounted. The graduated-scale support advantageously consists of a material having a precisely known small coefficient of thermal expansion, such as quartz glass, or of a material having a negligibly small coefficient of expansion, such as the commercially available glass ceramic material known as Zerodur. By these measures, length or other measurement errors attributable to thermal effects are minimized.