| Patent Number |
Title Of Patent |
Date Issued |
| 4035933 |
Response analyzing device |
July 19, 1977 |
| A response analyzing device comprises a discriminating device and a plurality of answering devices connected in parallel to a plurality of lines extending from the discriminating device. Each of the answering devices are provided with resonance circuits having mutually different reso |
| 3974332 |
Tablet for use in a coordinate digitizer |
August 10, 1976 |
| A capacitively coupled tablet for use with an electrically conductive pen comprises segments each including at least one lattice point of a matrix which comprises groups of spaced conductors which are disposed along coordinate axes. The segments are mutually electrically isolated by an |
| 3952425 |
Response analyzer |
April 27, 1976 |
| A response analyzer simultaneously receives multi-frequency signals transmitted from a plurality of answering devices and forms time divided pulses, which are counted to provide an indication of the number of answering devices which made responses. A plurality of AND gates are each a |
