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:
Mar. 18, 2014
Filed:
Sep. 25, 2009
Johannes Krul, Beuningen, NL;
Hendrik Van DE Kamp, Beekbergen, NL;
Jan Marius Van Dokkum, Ugchelen, NL;
Johannes Krul, Beuningen, NL;
Hendrik Van de Kamp, Beekbergen, NL;
Jan Marius Van Dokkum, Ugchelen, NL;
Arjowiggins Security B.V., Ugchelen, NL;
Abstract
According to one aspect, the invention relates to a method for producing a watermark element () for forming a shadow watermark image in a substrate by means of dewatering of a fibrous suspension, wherein the watermark element () comprises a body with a relief side () having a relief () and a dewatering side () positioned opposite the relief side, perforations () being provided at least in the relief (), a perforation () comprising a channel () with a channel inlet () at the relief side () and a channel outlet () at the dewatering side (), which method includes the steps of forming perforations in a body in a mechanical manner and introducing a relief in the intended relief side, the perforations () being formed in such a way that the dewatering capacity, expressed as the open surface area of the channel inlet(s) per unit of surface area of the relief, is dependent on the height (h) of the channel inlet () with respect to the dewatering side (), it being the case that the higher the height, the lower the dewatering capacity.