Patent US 3725724A
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| Patent number | US 3725724A (click link for details and documents via Google Patents) |
|---|---|
| Title | Deflection factor indicating apparatus |
| Inventors | Howard Vollum |
| Company | Tektronix Inc |
| Filing date | 1971-01-11 |
| Grant date | 1973-04-03 |
Related products:
| Manufacturer | Model | Description | Introduced | Designers |
|---|---|---|---|---|
| Tektronix | 464 | Portable 100 MHz dual-trace storage scope | 1975 | |
| Tektronix | 465 | Portable 100 MHz dual-trace scope | 1972 | Leon Orchard • Luis Navarro • Bob Shand • Jim Hinze • Frank Dewater • Pete Janowitz • Dave Laib • Al Schamel • Bert tenKate • Ken Holland • Bill Mark • George Ermini • Dennis Braatz |
| Tektronix | 475 | Portable 200 MHz dual-trace scope | 1972 | Leon Orchard • Luis Navarro • Bob Shand • Jim Hinze • Jim Godwin • Les Larson • Steve Tosh • Jim Woo • Ken Holland • Bill Mark • George Ermini • Dennis Braatz |
| Tektronix | 5A14N | Quad-channel 1 MHz amplifier | 1971 | |
| Tektronix | 5A26N | Dual 1 MHz differential amplifier | 1976 | |
| Tektronix | 5A48 | 60 MHz dual-channel amplifier plugin | 1974 |
This patent by Tek founder Howard Vollum describes the deflection factor indicators used on scopes like the popular 465 and 475, where one of two lamps − selected by the probe readout pin − illuminates the applicable number on a knob skirt.