Patent US1600535A successfully refreshed from Google Patents.
DICTOGRAPH PRODUCTS CO Inc
DICTOGRAPH
| Patent No. |
Title |
Status |
Filing Date |
Grant Date |
Claims |
Actions |
|
US2842623A
|
Transistor amplifier for telephone instrument |
Expired / Lapsed
|
1954-06-11 |
1958-07-08 |
0 |
Details
|
|
US2698368A
|
Fire alarm |
Expired / Lapsed
|
1951-06-08 |
1954-12-28 |
0 |
Details
|
|
US2475802A
|
Molding composition |
Expired / Lapsed
|
1945-03-07 |
1949-07-12 |
0 |
Details
|
|
US2394569A
|
Fitting hearing aid device |
Expired / Lapsed
|
1941-07-14 |
1946-02-12 |
0 |
Details
|
|
US2336828A
|
Portable microphone and amplifier |
Expired / Lapsed
|
1941-02-11 |
1943-12-14 |
0 |
Details
|