ALEXANDRIA, Va., Aug. 30 -- Masashi Fujikawa and Tomoji Suzuki, both of Nagano, Japan, have developed an ink cartridge detector.

According to the U.S. Patent & Trademark Office: "An ink cartridge is detachably mounted on a cartridge holder. At least one first reflector is provided in cartridge holder. A reflective-type optical sensor includes a light emitter and a light receiver. The optical sensor is operable to form an optical path originated from the light emitter to the light receiver via the first reflector."

An abstract of the invention, released by the Patent Office, said: "A shading member is provided in the ink cartridge operable to shade the optical path when the ink ...

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