Electroencephalograph monitoring apparatus
Abstract
Abstract 1. APPARATUS FOR MONITORING ELECTRIC SIGNALS IN THE HUMAN BRAIN, COMPRISING: A PAIR OF ELECTRODES, ADAPTED TO BE FIXED TO THE SCALP, FILTER MEANS COUPLED TO SAID ELECTRODES, HAVING A FREQUENCY VERSUS LOSS CHARACTERISTIC IN WHICH LOSS DECREASES WITH INCREASING FREQUENCY SO AS TO, IN OPERATION, SUBSTANTIALLY EQUALIZE THE AMPLITURE OF THE FILTER OUTPUT SIGNALS DUE TO RANDOM ELECTRICAL ACTIVITY OF THE BRAIN, THE SAID DECREASE IN LOSS WITH INCREASE IN FREQUENCY BEING FROM A LOW FREQUENCY DESIGNATED THE LOWER PREDETERMINED FREQUENCY, TO A HIGH FREQUENCY DESIGNATED THE UPPER PREDETERMINED FREQUENCY, THE UPPER AND LOWER PREDETERMINED FREQUENCIES BEING BELOW 30 C/S AND ABOVE 0.3 C/S, RESPECTIVELY, AND LOSS BELOW THE LOWER PREDETERMINED FREQUENCY, AND ABOVE THE UPPER PREDETERMINED FREQUENCY, BEING GREATER THAN THE LOSS AT THE LOWER AND UPPER PREDETERMINED FREQUENCIES, RESPECTIVELY, AMPLIFYING MEANS FOR AMPLIFYING SIGNALS WHICH PASS THROUGHH SAID FILTER MEANS, AND INDICATOR MEANS FOR INDICATING THE MAGNITUDE OF SIGNALS FROM SAID AMPLIFYING MEANS.
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| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |