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:
Aug. 31, 2004
Filed:
Apr. 18, 2002
Terje Melandso, Brumunddal, NO;
Frank Melandso, Kvaloysletta, NO;
Other;
Abstract
A device for coding an object where the codes themselves are in the foam of milled holes/indentation, and a method for reading the codes where the object with a code is placed under an ultrasound sender and receiver respectively. The holes/indentations ( ′) are provided in the object itself or on a material which is attached to the object, as the holes/indentations ( ′) are facing away from the object, and the holes/indentations ( ′) are covered by or filled with a material respectively. This material may be a thin film ( ′) in the size range of 0,1-3 mm or made by a surface treatment in the form of varnish/paint, plastic, laminate, wood or metal. The code may be devised in a material, i.e. thin film being attached to the object and covered and thus hidden. The codes may be made by milling or stamping on the material of the object or on the material attached to the object. The ultrasound sender unit is devised to send waves or a pulsed wave, forming standing waves, as the wave length L satisfies the relation a=(n/2) L where a is the thickness of the material hiding the code so that the wave which hits areas without holes becomes resonant, or the wave length where a+da=(n/2) L , where da is the depth of the hole so that the wave hitting the area with indentations/holes becomes resonant.