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. 18, 1989
Filed:
Mar. 28, 1984
James A Westphal, Altadena, CA (US);
Michael A Carr, La Crescenta, CA (US);
California Institute of Technology, Pasadena, CA (US);
Abstract
Apparatus is described for positioning a tilt meter (12) in a horizontal plane (14) and maintaining it horizontal despite temperature changes, with greater precision than heretofore. Leveling screws 25-27 which hold the upper surface (18) of a base member (16) precisely horizontal, are engaged with nuts (21-23) attached to the base member, where the nuts are made of the same material as the screws, to eliminate tilting of the base member with temperature changes, due to different nuts engaging a screw at a different height. The nuts are attached to the upper surface (18) of the base member, to further avoid imprecision. The curved glass bubble tubes (60) are mounted in V-grooves (80) in four point contact therewith.