US 11,054,922 B2
Using method of rewritable board
Chen-Kuei Chung, Tainan (TW); and Chung-Yu Yu, Tainan (TW)
Assigned to National Cheng Kung University, Tainan (TW)
Filed by NATIONAL CHENG KUNG UNIVERSITY, Tainan (TW)
Filed on Oct. 29, 2019, as Appl. No. 16/666,745.
Prior Publication US 2021/0124435 A1, Apr. 29, 2021
Int. Cl. B43L 1/10 (2006.01); G06F 3/0354 (2013.01); B43K 7/00 (2006.01)
CPC G06F 3/03545 (2013.01) [B43K 7/005 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method of using a rewritable board, comprising applying or removing a fluid on the rewritable board for writing repeatedly, wherein the rewritable board is an aluminum based material sequentially having a porous aluminum oxide layer and a metal layer thereon, and wherein the porous aluminum oxide layer has a porosity ranging from 10% to 80%.