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:
Jan. 17, 1995
Filed:
Jul. 15, 1993
Israel Amir, Princeton, NJ (US);
Ralph A Treder, Ewing, NJ (US);
AT&T Corp., Murray Hill, NJ (US);
Abstract
First and second plates (10 and 12), each having a reflective surface (14) opposite the reflective surface on the other plate, are aligned substantially parallel to each other by first separating the second plate (12) from the first one. A beam of collimated light (24) is then directed at the first plate (10) so the beam is reflected along a path lying in the field of view of a light detector (26). The second plate (12) is then positioned relative to the first plate (10) so that the beam (24) is reflected from the second plate onto the first plate for reflection therefrom onto the second plate so as to undergo at least one reverberation before being reflected from the second plate into the light detector so as to appear at substantially the same point before the plates were separated.