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Ribbon cassette and method for operating an electronically controlled typewriter

  • US 4,797,018 A
  • Filed: 10/02/1987
  • Issued: 01/10/1989
  • Est. Priority Date: 05/27/1987
  • Status: Expired due to Fees
First Claim
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1. A ribbon cassette for an electronically controlled typewriter said ribbon cassette comprising an electronic memory equipped with external electronic contacts, said memory being capable of storing a changeable value corresponding to a respective amount of ribbon left for use in the cassette, and which stored value can be changed as a result of electrical signals received via said contacts.

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