|
US2600962A
|
Tunable narrow band optical filter |
Expired / Lapsed
|
1948-10-09 |
1952-06-17 |
0 |
Details
|
|
US2362832A
|
Remote-control apparatus employing polarized electromagneti… |
Expired / Lapsed
|
1940-09-16 |
1944-11-14 |
0 |
Details
|
|
US2354243A
|
Apparatus and method for orienting the surface molecules of… |
Expired / Lapsed
|
1942-01-26 |
1944-07-25 |
0 |
Details
|
|
US2281100A
|
Method of manufacturing light polarizers |
Expired / Lapsed
|
1939-02-23 |
1942-04-28 |
0 |
Details
|