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. 01, 1981
Filed:
Oct. 16, 1979
Francois M Mottier, South Windsor, CT (US);
Otis Elevator Company, Hartford, CT (US);
Abstract
The perimeter of an area is scanned along two adjacent paths which define spacially resolved gates through which objects and people must pass to enter and leave the area. As the gates are scanned, the presence of objects and people are detected. A complete scan produces a gate signature which includes information indicative of the presence and location of objects and people in each gate during the scan. Successive signatures are compared in sequence as scans are made in order to determine changes caused by movement of objects and people in or out of the area. From this comparison an up/down counter is controlled to maintain a dynamic count of the number of objects or people in the area following each scan of the gates. The counter counts up as objects and people enter the area and counts down as they leave.