Patent comparison

Compare Patents

Compare two patents side by side. Add ?a=us/7657849&b=us/8046721 to the URL to load specific patents.

US 2266401

How Pulse Code Modulation Digitizes Analog Signals

A foundational 1938 patent describing how to convert continuous sound waves into a stream of digital numbers for transmission.

Statusexpired

Granted1941

Expires1958

Claims0

Forward citations181

Prior art0

AssigneeInternational Standard Electric Corp

InventorsReeves Alec Harley

Patent B

Add ?b=us/7657849 to compare

How to use

Bookmark a comparison URL to save it. Format: /compare?a=[country]/[number]&b=[country]/[number]. Example: /compare?a=us/7657849&b=us/8046721