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:
Sep. 01, 1998
Filed:
Mar. 21, 1997
Leuze lumiflex GmbH & Co., Munich, DE;
Abstract
A photoelectric barrier and operation thereof, the barrier having at least two pairs of transmitters/receivers each operating synchronously. Each of the two transmitters transmits a light signal having a specific identifier, the signal being in the form of a double pulse separated by a pause, which double pulse consists of two pulse groups each separated by a pause, and each receiver then evaluates a light signal of the associated transmitter as correctly received when at least one of the two pulse groups is recognized as valid by means of the associated identifier, in which the duration of the pulse groups and the pauses between them are established so that at most one pulse group of one double pulse of the one transmitter is superimposed with one pulse group of one double pulse of the other transmitter.