Patent US1978656A successfully refreshed from Google Patents.
| Patent No. |
Title |
Status |
Filing Date |
Grant Date |
Claims |
Actions |
|
US4034176A
|
Membrane switch apparatus |
Expired / Lapsed
|
1975-06-11 |
1977-07-05 |
8 |
Details
|
|
US3995126A
|
Membrane keyboard apparatus |
Expired / Lapsed
|
1975-04-03 |
1976-11-30 |
11 |
Details
|
|
US3988551A
|
Membrane keyboard apparatus having common apertured electro… |
Expired / Lapsed
|
1975-04-03 |
1976-10-26 |
10 |
Details
|
|
US3947696A
|
Touch actuated electronic switch |
Expired / Lapsed
|
1974-11-04 |
1976-03-30 |
85 |
Details
|
|
US3887848A
|
Apparatus and material for protecting microelectronics from… |
Expired / Lapsed
|
1972-08-14 |
1975-06-03 |
83 |
Details
|
|
US3766404A
|
Composite d.c. amplifier for use with a touch sensitive ele… |
Expired / Lapsed
|
1971-11-16 |
1973-10-16 |
14 |
Details
|