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Portable calculator

  • US 4,002,892 A
  • Filed: 09/16/1974
  • Issued: 01/11/1977
  • Est. Priority Date: 09/15/1973
  • Status: Expired due to Term
First Claim
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1. A portable electronic calculator comprising a housing of substantially rectangular outline having a length greater than its width and being of shallow height relative to its width, said housing having an end opening receptacle at one end thereof surrounded by top, bottom and side walls, a first printed circuit board retained in said housing inwardly of said receptacle and having connected thereto a keyboard, an electronic arithmetic unit, and a multi-digit display unit, said housing having appropriate areas for visual access to said display unit and for manual access to said keyboard, a second printed circuit board, and electrical supply unit on said second printed circuit board, said electrical supply unit and said second printed circuit board being movable into and out of said receptacle and positioned thereon by said walls, and plug- and-socket connection means between said first and second printed circuit boards and automatically engaging and disengaging upon insertion and withdrawal of said second printed circuit board and electrical supply unit said second printed circuit board and said electrical supply unit being housed in a rectangular block fitting within said receptacle.

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