US Patent Issued to Boang Zheng on Oct. 21 for "Positive and negative pressure system and operation method therefor, and positive and negative pressure electrical appliance using positive and negative pressure system" (Chinese Inventors)

ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,449,827, issued on Oct. 21, was assigned to Boang Zheng (Beijing).

"Positive and negative pressure system and operation method therefor, and positive and negative pressure electrical appliance using positive and negative pressure system" was invented by Boang Zheng (Beijing).

According to the abstract* released by the U.S. Patent & Trademark Office: "A positive and negative pressure system and an operation method therefor, and a positive and negative pressure electrical appliance using the positive and negative pressure system. The positive and negative pressure electrical appliance comprises: a positive and negative pressure refrigerator, a positive and negative pressure washing mac...