Is this a real patent?

Yes — the original drawing as filed at the U.S. Patent Office, cleaned and printed. Public domain by law.

An unframed print on 200 g/m² matte paper, printed in Europe. Dispatched in 2–4 working days, followed by transit. Shipping is included to Spain, Portugal, France, Germany, Italy, Netherlands, Belgium, Austria and Ireland. Tracking by email.

What if it arrives damaged?

Send a photo within 7 days and we reprint and reship it free.

PD-90 · US 3,475,623

Electronic Filter

Original patent print · 1969

The Moog ladder filter — the transistor circuit that defined the sound of electronic music.

200 g/m² matte paper · Unframed

29 € · Shipping included · Choose size ↓

Electronic Filter patent drawing, 1969, archive paper finish

US 3,475,623Electronic Filter1969

Inventor: R. A. Moog
Patented: October 28, 1969

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Total29 €

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Shipping to Spain, Portugal, France, Germany, Italy, Netherlands, Belgium, Austria and Ireland. Delivery time includes transit after dispatch.

PD-90 · US 3,475,623 · Filed October 10, 1966 · Trumansburg, N.Y.

Pairs well with

Full collection

Common questions

Is this a real patent?: Yes — the original drawing as filed at the U.S. Patent Office, cleaned and printed. Public domain by law.
How is it shipped?: An unframed print on 200 g/m² matte paper, printed in Europe. Dispatched in 2–4 working days, followed by transit. Shipping is included to Spain, Portugal, France, Germany, Italy, Netherlands, Belgium, Austria and Ireland. Tracking by email.
What if it arrives damaged?: Send a photo within 7 days and we reprint and reship it free.

Read the full FAQ

Electronic Filter

Pairs well with

Phonograph or Speaking Machine

Gramophone

Loud-speaker

Common questions