Observed arrival · 2026-10-22
PatentGuessr makes patent history a guessing game
A browser game challenges players to inspect real U.S. patent drawings and descriptions, then guess the year each patent was granted.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Players curious about patent history
- Worth noticing
- The guide distinguishes grant year from filing date and notes that grants may follow filing by 2–5 years or more.
Field notes
The game draws from a stated pool of 100 U.S. patents, with the daily round using the same five records for every player; practice and timed play draw from that pool. Players can rotate or inspect drawings, open the patent PDF or record, and enter a grant-year guess by typing or using a slider. Its dating guide points to clues in lettering, drawing style, terminology, and technology, while warning that filing and grant dates can differ by several years.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue