|
US3654603A
|
Communications exchange |
Expired / Lapsed
|
1969-10-31 |
1972-04-04 |
7 |
Details
|
|
US3586880A
|
Isolation and compensation of sample and hold circuits |
Expired / Lapsed
|
1969-08-11 |
1971-06-22 |
13 |
Details
|
|
US3462588A
|
Digital attenuator which controls a variable conductance |
Expired / Lapsed
|
1966-02-17 |
1969-08-19 |
0 |
Details
|
|
US3399352A
|
Phase detector output smoothing network |
Expired / Lapsed
|
1965-03-19 |
1968-08-27 |
0 |
Details
|