William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 7293510 | Telescopic leg structure of a table A telescopic leg of a table consists of an outer tubular member, and an inner tubular member inserted in the outer tubular member; the outer tubular member is coupled to a top of a table, and has a bolt hole; the inner tubular member has a flat pressed side facing t... | 11/13/2007 |
| 7191565 | Connecting structure of an assembled type screen An assembled type screen includes screen boards, locating elements secured to vertical edges of the screen boards, and several elongate connecting members connected to the vertical edge portions of the screen boards; the locating elements are outwardly folded at the... | 03/20/2007 |
| 5546718 | Partition wall A partition wall comprising a plurality of partition wall units each of which includes two extruded hollow aluminum columns, two extruded hollow aluminum beams, and four plastic joints; a plurality of resilient snap elements; a plurality of holding bars; ... | 08/20/1996 |