Portfolio comparison
Sperry Gyroscope Co Inc vs Hangzhou Tonghuashun Data Processing Co
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 1242065· 1917
How Elmer Sperry Invented the Gyroscopic Compass for Ships
Activity by Decade
1910s1
Company B
Hangzhou Tonghuashun Data Processing Co
Patents indexed
1
softwareai_mlecommercetelecommunicationsfinance
Top Patents1 enriched
US 20230419182
How AI and Blockchain Team Up to Predict What You'll Buy
How to use
Bookmark a comparison URL to save it. Format: /compare/companies?a=[slug]&b=[slug]. Also see patent-level comparison.