Patent US 2883619A

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Patent number US 2883619A (click link for details and documents via Google Patents)
Title Electrical probe
Inventors John Kobbe, Bill Polits
Company Tektronix Inc
Filing date 1956-02-29
Grant date 1959-04-21

Cited By:

Patent Title Inventors Assignee Granted
Patent US 3256484A High voltage test probe containing a part gas, part liquid dielectric fluid under pressure and having a transparent housing section for viewing the presence of the liquid therein Paul V Terry Tektronix Inc 1966-06-14

Related products:

Manufacturer Model Description Introduced Designers
Tektronix P410 10× passive probe 1955

The 10th Tektronix patent, this is the famous invention of using lossy coax cable (a resistive center conductor) in a passive probe to dampen reflections and ringing.

John Kobbe said:

Another anticipated problem with passive probe, we knew a signal bounced back and forth so we could not use the standard probe.

While thinking about things to do like some damping resistors. Why not us a fine resistance wire as the center conductor.

This time we really lucked out, it worked better than anticipated. It was even patent-able as was unblanking and [the] sweep circuit.

Until the early 1970s, Tektronix manufactured lossy coax cable in-house using repurposed shoelace weaving machines: https://vintagetek.org/june-photo-of-the-month-coax-cable-production/

See also