query: when did charles goodyear invented rubber?
answers: [ " D u r i n g t h e e a r l y 1 8 3 0 ' s h e b e g a n i n v e n t i n g , f i l i n g s i x p a t e n t s b e t w e e n 1 8 3 0 a n d 1 8 3 4 , a n d d u r i n g t h i s p e r i o d b e c a m e i n t e r e s t e d i n r u b b e r , w h i c h h e t r i e d - u n s u c c e s s f u l l y - t o u s e i n s o m e o f h i s m e c h a n i c a l i n v e n t i o n s . " ]