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-43 · US 1,203,495

Vacuum-tube

Original patent print · 1916

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

200 g/m² matte paper · Unframed

29 € · Shipping included · Choose size ↓

Vacuum-tube patent drawing, 1916, archive paper finish

US 1,203,495Vacuum-tube1916

Inventor: William D. Coolidge
Patented: October 31, 1916

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Total29 €

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

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

Vacuum-tube

Pairs well with

Incandescent Electric Lamp

Electro-magnetic motor

Apparatus for transmitting electrical energy

Common questions