TODAY’S PATENT – IMPACT RESISTANT HELMET

The IMPACT RESISTANT HELMET was invented by H. L. Li and D. C. Prevorsek on the 4th of September 1990, bearing patent number US4953234A.

This present invention generally relates to an impact resistant composite and helmet made thereof. The helmet comprises an impact resistant composite shell. The composite shell comprises a plurality of prepreg packets. Each prepreg packet comprises at least about 2 and preferably 5 to 20 prepreg layers. There are from 2 to 50 and preferably 5 to 20 prepreg packets. Each prepreg layer comprises a plurality of unidirectional coplanar fibers embedded in a polymeric matrix. The fibers of adjacent layers in the prepreg packets are at an angle of from 45° to 90°, preferably 60° to 90°, more preferably 80° to 90° and most preferably about 90° from each other. The angle of the fiber in alternate layers is preferably, substantially the same.