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 1,781,541Refrigeration1930

PD-50 · US 1,781,541

Name: Refrigeration Patent Print (1930)
Brand: PATENT DEPT.
SKU: PD-50
Availability: InStock

Einstein and Szilard's refrigerator with no moving parts — two physicists moonlighting as appliance engineers, 1930.

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Total29 €

Shipping included (EU)

PD-50 · US 1,781,541 · Filed December 16, 1927 ·

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.