US 12,145,394 B2
Ultrasonic bonding of security device to a substrate to prevent harvesting
Pazam Subramanian, Hollis, NH (US); and Eric M. Ziegler, Lexington, MA (US)
Assigned to Crane & Co., Inc., Dalton, MA (US)
Appl. No. 17/757,817
Filed by Crane & Co., Inc., Dalton, MA (US)
PCT Filed Dec. 9, 2020, PCT No. PCT/US2020/064115
§ 371(c)(1), (2) Date Jun. 21, 2022,
PCT Pub. No. WO2021/133555, PCT Pub. Date Jul. 1, 2021.
Claims priority of provisional application 62/953,134, filed on Dec. 23, 2019.
Prior Publication US 2023/0012627 A1, Jan. 19, 2023
Int. Cl. B42D 25/45 (2014.01); B42D 25/29 (2014.01); B42D 25/324 (2014.01); B42D 25/351 (2014.01); B42D 25/355 (2014.01); B42D 25/455 (2014.01); B42D 25/46 (2014.01)
CPC B42D 25/324 (2014.10) [B42D 25/29 (2014.10); B42D 25/351 (2014.10); B42D 25/355 (2014.10); B42D 25/45 (2014.10); B42D 25/455 (2014.10); B42D 25/46 (2014.10)] 9 Claims
OG exemplary drawing
 
1. A security document, comprising:
a substrate comprising a first surface and a second surface opposite to the first surface, the first surface comprising a cellulosic material;
an optical security device comprising:
optical indicia of authenticity of the security document, and
a third surface, the third surface comprising a thermoplastic polymer; and
an ultrasonic weld forming a bond between a section of the first surface and a section of the third surface,
wherein a first portion of the optical security device is embedded in the substrate, forming a bridge region,
wherein a second portion of the optical security device is visibly disposed on the first surface, forming a window region, and
wherein the ultrasonic weld is disposed only in the bridge region.