Is this a real patent?

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

Printed in Europe on 200 g/m² matte paper. Small sizes ship flat, 50 × 70 ships rolled in a tube. Tracking by email.

What if it arrives damaged?

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

US 3,475,623Electronic Filter1969

PD-90 · US 3,475,623

Name: Electronic Filter Patent Print (1969)
Brand: PATENT DEPT.
SKU: PD-90
Availability: InStock

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

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Total29 €

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

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?: Printed in Europe on 200 g/m² matte paper. Small sizes ship flat, 50 × 70 ships rolled in a tube. Tracking by email.
What if it arrives damaged?: Send a photo within 7 days and we reprint and reship it free.