Portfolio comparison
LaMarcus A. Thompson vs Henry W. Seely
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 310966· 1885
Early Roller Coaster Design for Thrill Rides
Activity by Decade
1880s1
Top Patents1 enriched
US 259054· 1882
Henry Seely's 1882 Electric Flatiron
Activity by Decade
1880s1
How to use
Bookmark a comparison URL to save it. Format: /compare/companies?a=[slug]&b=[slug]. Also see patent-level comparison.