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. 30, 1986
Filed:
Feb. 27, 1985
Ernst A Kilian, Bremen, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
Apparatus for monitoring the time duration in which a visitor remains in a defined region on the way from a visited place to another place, more particularly from the entry to the visited place and back, freely and without supervision. At the entry place, the visitor receives a transmitter with a timing member. After termination of a given time duration which corresponds to the normal travelling time of the visitor between the visited places, the transmitter transmits an individual identification signal which is received by a central receiver and is decoded. It can be immediately ascertained which visitor dwells for too long a time within the defined region so that searching or controlling measures can be initiated.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile