als , ▁and ▁described ▁in ▁a ▁sequence ▁of ▁pat ents ▁from ▁ 1 9 3 4 ▁to ▁ 1 9 4 4 ▁for ▁the ▁fabric ation ▁of ▁text ile ▁y ar ns . ▁Elect ro sp in ning ▁from ▁a ▁m elt ▁rather ▁than ▁a ▁solution ▁was ▁pat ented ▁by ▁C . L . ▁N orton ▁in ▁ 1 9 3 6 ▁using ▁an ▁air - blast ▁to ▁assist ▁fi ber ▁formation . ▁ ▁In ▁ 1 9 3 8 ▁N ath al ie ▁D . ▁Ro zen bl um ▁and ▁Ig or ▁V . ▁Pet ry an ov - S ok ol ov , ▁working ▁in ▁Nikol ai ▁A . ▁F uchs ' ▁group ▁at ▁the ▁A eros ol ▁Labor atory ▁of ▁the ▁L . ▁Ya . ▁Kar p ov ▁Institute ▁in ▁the ▁USS R , ▁generated ▁electro sp un ▁fib ers , ▁which ▁they ▁developed ▁into ▁filter ▁materials ▁known ▁as ▁" P etry an ov ▁filters ". ▁By ▁ 1 9 3 9 , ▁this ▁work ▁had ▁led ▁to ▁the ▁establishment ▁of ▁a ▁factory ▁in ▁T ver ' ▁for ▁the ▁manufact ure ▁of ▁electro sp un ▁smoke ▁filter ▁elements ▁for ▁gas ▁mask s . ▁The ▁material , ▁dub bed ▁B F ▁( B attle field ▁Filter ) ▁was ▁sp un ▁from ▁cell ul ose ▁ac et ate ▁in ▁a ▁sol vent ▁mixture ▁of ▁dich lor o eth ane ▁and ▁eth an ol . ▁By ▁the ▁ 1 9 6 0 s ▁output ▁of ▁sp un ▁fil tr ation ▁material ▁was ▁claimed