Patent US 3551726A
| Patent number | US 3551726A (click link for details and documents via Google Patents) |
|---|---|
| Title | Thermionic electron emission device having low heat loss |
| Inventors | Luther Earl Blankenship |
| Company | Tektronix Inc |
| Filing date | 1968-09-23 |
| Grant date | 1970-12-29 |