Portfolio comparison
William F. Semple vs FARBENFABRIKEN OF ELBERFELD Co
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 644077· 1900
How Felix Hoffmann Invented Aspirin
Activity by Decade
1900s1
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