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.

Multipoint data communication system with collision detection patent drawing, 1977

US 4,063,220Multipoint data communication system with collision detection1977

PD-97 · US 4,063,220

Multipoint data communication system with collision detection

Metcalfe's Ethernet, 1977 — collision detection for office computers, now the plumbing of the internet.

Inventor: Robert M. Metcalfe
Patented: December 13, 1977

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PD-97 · US 4,063,220 · Filed March 31, 1975 ·

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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?: 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.

Read the full FAQ

Multipoint data communication system with collision detection

Pairs well with

Art of compiling statistics

Type Writing Machine

Three-electrode circuit element utilizing semiconductive materials

Common questions