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 1,203,495Vacuum-tube1916

PD-43 · US 1,203,495

Name: Vacuum-tube Patent Print (1916)
Brand: PATENT DEPT.
SKU: PD-43
Availability: InStock

Coolidge's X-ray tube, patented as a plain 'vacuum tube' in 1916 — the design that made radiography routine for a century.

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PD-43 · US 1,203,495 · Filed May 9, 1913 ·

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.