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:
Oct. 06, 1998
Filed:
May. 08, 1997
Eric Saurer, Bevaix, CH;
Roland Jeanmonod, Neuchatel, CH;
Asulab S.A., Bienne, CH;
Abstract
The invention concerns an ultrasonic detection device intended to detect the presence of foreign bodies, on the surface of a window comprising a first sheet having a first thickness, comprising a transducer co-operating with a first face of said first sheet, said transducer being able to emit an ultrasonic signal of frequency f.sub.t and also able to receive a reflected ultrasonic signal on a second face of the first sheet, the variation in said reflected signal being representative of the presence or absence of foreign bodies on said second face facing said transducer. This device is characterized in that the frequency f.sub.t is selected to satisfy the following equation: