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EP0193556
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Extract from the Register of European Patents
EP Citations: EP0193556
| Cited in | International search | Type: | Patent literature | Publication No.: | US3648050
[ ]; | Type: | Patent literature | Publication No.: | US3856127
[ ]; | Type: | Patent literature | Publication No.: | US4417824
[ ]; | Type: | Patent literature | Publication No.: | EP0054644
[ ]; | Type: | Patent literature | Publication No.: | WO8100773
[ ] | Type: | Non-patent literature | Publication information: | [X] - Computer Design, Vol. 21, No. 3, March 1982 (Winchester, Mass. US) EIDSMORE: "Keystrokes Detected by Interrupting light-Beams in low Profile Keyboard", pages 66-67 see figures 1,2; right hand column, line 27 - page 70line 19 | Type: | Non-patent literature | Publication information: | [X] - IBM Technical Disclosure Bulletin, Vol. 17, No. 3, August 1974 (New York, US) UBERBACHER: "Optical Keyboard", pages 822-823, see figures 1,3: page 822, line 1 - page 823line 7 | Type: | Non-patent literature | Publication information: | [A] - IBM Technical Disclosure Bulletin, Vol. 23, No. 11, April 1981 (New York, US) DUNCAN et al.: "Optical Keyboard", pages 4998-4999see figures; pages 4998-4999 |