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. 12, 1977
Filed:
Feb. 19, 1976
James D Ramsay, Los Altos, CA (US);
Other;
Abstract
Transmitters generating rotating laser beams are commonly employed for surveying and earth working equipment control purposes. This invention relates to a method and apparatus for automatically maintaining the rotating laser beam in a required plane which is either exactly horizontal or at a known angle to the horizontal. The apparatus includes two remotely located laser beam reflectors which, when traversed by the rotating laser beam, respectively reflect the beam back to the transmitter along a path parallel to, but vertically displaced from the original path of the beam from the transmitter. Receiving equipment at the transmitter analyzes the vertical positions of the two reflected beams and effects any required correction of the position of the transmitter to maintain the rotating laser beam in the desired plane.