Ink ribbon and correction tape cassette compatibility

  • US 4,900,171 A
  • Filed: 11/30/1987
  • Issued: 02/13/1990
  • Est. Priority Date: 11/30/1987
  • Status: Expired due to Term
First Claim
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1. In a system utilizing a first and second cassette, said system comprising in combination:

  • a device in which a first and second cassette are inserted for operation of the device;

    a switch mounted on said device and connected to a power source for controlling the flow of electricity to said device;

    a first cassette for use in said device, said first cassette having an ink ribbon;

    a second cassette for use in said device, said second cassette having a correction tape; and

    means for assuring that the ink ribbon in the first cassette and the correction tape in the second cassette are functionally compatible with each other and for conditioning the switch to permit the flow of electricity from the power source to said device to activate said device only when the functional compatibility of said ink ribbon in the first cassette and the correction tape in the second cassette is assured.

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