US 12,030,337 B2
Refillable free ink writing instrument, kit comprising such a writing instrument, and method thereof
Arnaud Bez, Clichy (FR); and Etienne Roudaut, Clichy (FR)
Assigned to SOCIÉTÉ BIC, Clichy (FR)
Appl. No. 18/041,651
Filed by SOCIÉTÉ BIC, Clichy (FR)
PCT Filed Aug. 30, 2021, PCT No. PCT/EP2021/073834
§ 371(c)(1), (2) Date Feb. 14, 2023,
PCT Pub. No. WO2022/043541, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 20305962 (EP), filed on Aug. 31, 2020.
Prior Publication US 2023/0311557 A1, Oct. 5, 2023
Int. Cl. B43K 5/03 (2006.01); B43K 7/02 (2006.01)
CPC B43K 5/03 (2013.01) [B43K 7/02 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A refillable free ink writing instrument comprising a body having a rear end, a front end and an ink reservoir disposed between the rear end and the front end, a writing tip mounted on the front end and a plug mounted on the rear end, wherein the plug is configured to close an opening in fluid communication with the ink reservoir, the plug being configured to be removable from the rear end to refill the ink reservoir with water and concentrated ink refill, wherein the opening is provided with a sealing membrane having one or more cuts configured to allow elastic deformation of the sealing membrane when a predetermined pressure is applied thereto, and the sealing membrane is configured to adopt to states, a rest state in which the membrane prevents ink from flowing out of the ink reservoir and a working state in which the membrane allows introduction of water and of the concentrated ink refill into the ink reservoir.