Portfolio comparison
William F. Semple vs MAY B CORNWALL
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 98304· 1869
William Semple's 1869 Patent for Improved Chewing Gum
Activity by Decade
1860s1
Top Patents1 enriched
US 1469997· 1923
A 1920s Design for a Suspended Monorail Transportation System
Activity by Decade
1920s1
How to use
Bookmark a comparison URL to save it. Format: /compare/companies?a=[slug]&b=[slug]. Also see patent-level comparison.