80
True
United States
The modern doorknob was invented in 1878 by Osbourn Dorsey, a 16-year-old African American inventor.
The claim that Osbourn Dorsey invented the modern doorknob in 1878 is supported by web sources. The Black Wall Street Times notes that Dorsey patented the doorknob and doorstop in that year, using cast iron to improve on previous versions. This claim is historical and appears well-supported by available sources, indicating that Dorsey's contribution to the invention of the modern doorknob is recognized by multiple accounts.
Individual Claims
80
True
Invention
The modern doorknob was invented in 1878 by 16-year-old African American inventor Osbourn Dorsey.
The claim is substantiated by sources indicating that Osbourn Dorsey patented the doorknob in 1878. According to The Black Wall Street Times, Dorsey’s use of cast iron represented a significant improvement over earlier designs, suggesting the claim is accurate.
Fact Check Score
None
Fact Check Weight
0
Web Consensus Score
90
Web Consensus Weight
50
Source Quality Score
80
Source Quality Weight
25
Llm Reasoning Score
85
Llm Reasoning Weight
25
Weighted Total
80
Evidence Summary
Web evidence supports the claim with sources confirming Dorsey's patent of the doorknob in 1878.
