1June, 943, Biro and his brother Georg applied for a new patent to the European Patent Office and produced the first commercial ballpoint pen-Biro ballpoint pen.
Later, the British government bought the right to use this patented ballpoint pen, so that these ballpoint pens could be used by the crew of the Royal Air Force. In addition to being stronger than traditional pens, ballpoint pens can also be used at low pressure and high altitude.
Extended data:
It takes more than 20 processes to produce a small ballpoint pen. There are five grooves in the pen to guide the ink, and the value of the grooves should be accurate to one thousandth of a millimeter. The nib is divided into a ball and a ball seat on the nib.
Previously, domestic balls, namely tungsten carbide balls, could not only meet the domestic production demand, but also be exported to foreign countries in large quantities. For the pen tip steel with a diameter of only 2.3 mm, its production equipment and raw materials need to be completely imported.
At the top of the pen tip steel, the thickness is only 0.3~0.4 mm, and the raw materials used for processing the pen tip steel should meet the requirements of easy cutting and no cracking. Such machining accuracy puts forward extremely high performance requirements for stainless steel raw materials. Small nib steel is actually testing the entire high-precision stainless steel production field in China.
Baidu encyclopedia-ballpoint pen