|
US4843275A
|
Air buoyant piezoelectric polymeric film microphone |
Expired / Lapsed
|
1988-01-19 |
1989-06-27 |
28 |
Details
|
|
US4406059A
|
Method for making a piezoelectric transducer |
Expired / Lapsed
|
1981-04-22 |
1983-09-27 |
3 |
Details
|
|
US4161949A
|
Aseptic connector |
Expired / Lapsed
|
1977-10-27 |
1979-07-24 |
11 |
Details
|
|
US3885695A
|
Snap-on safety closure for containers |
Expired / Lapsed
|
1974-05-29 |
1975-05-27 |
14 |
Details
|