Start typing to search across the full knowledge system.
Canonical Source · patent
This page documents how this source is reused across Claim by Claim. A source can support, challenge, qualify or contextualize different claims; appearing here does not imply endorsement of every linked proposition.
Evidence context
Evidence roles describe what this source helps establish inside each Investigation. They are local to that use, not permanent labels attached to the publication itself.
Investigation
The original Bardeen–Brattain semiconductor patent filed June 1948 documents the physical transistor structure following Bell laboratory experimentation, challenging claims of a device with no human precursor.
Investigation
A contemporaneous point-contact transistor patent and documented December 1947 laboratory work show how semiconductor contact and amplification problems were solved by identifiable engineering steps.
Subject families