Portfolio comparison
Walter Hunt vs Glass Marvin and Associates
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 6281· 1849
How Walter Hunt Invented the Modern Safety Pin
Activity by Decade
1840s1
Top Patents1 enriched
US 3333846· 1967
How the Classic Operation Board Game Works
Activity by Decade
1960s1
How to use
Bookmark a comparison URL to save it. Format: /compare/companies?a=[slug]&b=[slug]. Also see patent-level comparison.