Portfolio comparison
Theophilus Van Kannel vs Samuel Colt
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 387571· 1888
How the Revolving Door Was Invented
Activity by Decade
1880s1
Top Patents1 enriched
US 1304· 1839
Samuel Colt's Early Revolving Firearm Mechanism
Activity by Decade
1830s1
How to use
Bookmark a comparison URL to save it. Format: /compare/companies?a=[slug]&b=[slug]. Also see patent-level comparison.