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. 04, 2001
Filed:
Oct. 06, 1999
David W. Davis, Little Rock, AR (US);
Litton Systems, Inc., Woodland Hills, CA (US);
Abstract
A distance judging system (S) includes at least two spaced apart marker devices (,) formed on a first object (,) and providing a signal (,). A viewer (A) is adapted to detect relative position of the signals (,) from the markers (,), and create an image (,) of the relative positions of the markers (,) within a field of view (,). A reticle (,) is superimposed on the field of view (,) of the viewer (A). The reticle (,) is selected to form a control area (,) within which simultaneous appearance of at least two images (,) of the markers (,) indicates that the first object (,) is at a distance (,) at least as great as a desired distance from the viewing apparatus (A); whereas, simultaneous appearance of less than two images (,) of the markers (,) within the control area (,) indicates that the first object (,) is at a distance (,) less than the desired distance.