Abstract: A ballpoint pen system having a slidable pen cap. A ballpoint ink cartridge disposed inside a pen housing has a ballpoint tip protruding out of a pen housing anterior aperture. The pen cap is disposed on a pen housing anterior end for capping the ballpoint tip. At least one linear pen cap through-slot is disposed through a pen cap side surface. At least one raised stopper located on the pen housing near the pen housing anterior end is disposed through the through-slot of the pen cap such that linearly sliding the pen cap causes the pen cap to move longitudinally relative to the pen housing. Sliding the pen cap to an extended position causes the pen cap to cover the ballpoint tip. Sliding the pen cap to a retracted position causes the ballpoint tip to protrude from the pen cap anterior aperture.

Abstract: A ballpoint pen system having a slidable pen cap. A ballpoint ink cartridge disposed inside a pen housing has a ballpoint tip protruding out of a pen housing anterior aperture. The pen cap is disposed on a pen housing anterior end for capping the ballpoint tip. At least one linear pen cap through-slot is disposed through a pen cap side surface. At least one raised stopper located on the pen housing near the pen housing anterior end is disposed through the through-slot of the pen cap such that linearly sliding the pen cap causes the pen cap to move longitudinally relative to the pen housing. Sliding the pen cap to an extended position causes the pen cap to cover the ballpoint tip. Sliding the pen cap to a retracted position causes the ballpoint tip to protrude from the pen cap anterior aperture.

Abstract: A ballpoint pen system has a pen housing, a top cap, and a ballpoint ink cartridge located in the pen housing. The top cap is located on a pen housing anterior end. In a first closed position a top cap anterior internal annular ridge and a top cap posterior internal annular ridge engage an anterior annular groove and a median annular groove of the pen housing, respectively. In a second, open position, the top cap anterior internal annular ridge and the top cap posterior internal annular ridge engage the median annular groove and a posterior annular groove of the pen housing, respectively. In a first position, the ballpoint tip is located below a top cap anterior end aperture. In a second position, the ballpoint tip is located above and through the top cap anterior end aperture.

Abstract: A ballpoint pen system has a pen housing, a top cap, and a ballpoint ink cartridge located in the pen housing. The top cap is located on a pen housing anterior end. In a first closed position a top cap anterior internal annular ridge and a top cap posterior internal annular ridge engage an anterior annular groove and a median annular groove of the pen housing, respectively. In a second, open position, the top cap anterior internal annular ridge and the top cap posterior internal annular ridge engage the median annular groove and a posterior annular groove of the pen housing, respectively. In a first position, the ballpoint tip is located below a top cap anterior end aperture. In a second position, the ballpoint tip is located above and through the top cap anterior end aperture.