US Patent Issued on April 7 for "Manufacturing method of an intelligent anti-terrorism protective door" (Chinese Inventors)

ALEXANDRIA, Va., April 7 -- United States Patent no. 12,595,701, issued on April 7.

"Manufacturing method of an intelligent anti-terrorism protective door" was invented by Lili Liu (Yingkou, China) and Enyuan Liu (Yingkou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A manufacturing method of an intelligent anti-terrorism protective door comprises the following steps: S1, making front and rear door panels; S2, cutting the composite door core panel materials; S3, making protective door frame; S4, assembling bulletproof and explosion-proof armored composite door core panel; S5, making the door frame; S6, decorating the surface of the protective door; S7, overall assembly; S8, installing the lock; S9, p...