US 12,137,730 B2
Cooling cigarette filter and smoking product
Wei Luo, Hunan (CN); Kejun Zhong, Hunan (CN); Jianfu Liu, Hunan (CN); Lanying Xie, Hunan (CN); Liangsheng Qin, Hunan (CN); Wen Du, Hunan (CN); Jianhua Yi, Hunan (CN); Xinqiang Yin, Hunan (CN); Duo Ding, Hunan (CN); Jianhui Wen, Hunan (CN); and Guoyong Xie, Hunan (CN)
Assigned to CHINA TOBACCO HUNAN INDUSTRIAL CO., LTD., Hunan (CN)
Appl. No. 17/418,219
Filed by CHINA TOBACCO HUNAN INDUSTRIAL CO., LTD., Hunan (CN)
PCT Filed Feb. 20, 2019, PCT No. PCT/CN2019/075521
§ 371(c)(1), (2) Date Jun. 24, 2021,
PCT Pub. No. WO2020/133647, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 201811598788.5 (CN), filed on Dec. 26, 2018.
Prior Publication US 2022/0079215 A1, Mar. 17, 2022
Int. Cl. A24D 3/04 (2006.01); A24D 1/20 (2020.01); A24D 3/02 (2006.01); A24D 3/06 (2006.01); A24D 3/14 (2006.01); A24D 3/16 (2006.01)
CPC A24D 3/048 (2013.01) [A24D 1/20 (2020.01); A24D 3/0275 (2013.01); A24D 3/066 (2013.01); A24D 3/067 (2013.01); A24D 3/14 (2013.01); A24D 3/16 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A cooling cigarette filter, comprising a cooling section, wherein:
the cooling section is provided with one or more channels connecting two ends of the cooling section;
an inner surface of each channel is coated with a cooling material;
the cooling material is a compound mixture of an inorganic phase change material and PEG; and
the inorganic phase change material comprises at least one of Na2CO3·10H2O, CH3COONa·3H2O, CaCl2·4H2O, and Na2SO4·10H2O.