In 1898 Parker was granted a patent which showed the first
slip-fit type of outer cap and by a year later he had almost 9,000
dealers selling his pens. By 1904 Parker had introduced a
lever type filling method which incorporated a rubber sac which
fitted to the section very similar to present pens. This new
innovation is viewed as one of fountain pens great advances.<br/><br/><b>SHEAFFER</b> 是拉桿式專利的所有者。但是其拉桿式設計是從派克的原始設計而來。<br/>