Portfolio comparison
William F. Semple vs F Hoffmann La Roche AG
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 3927193· 1975
Using Radioactive Antibodies to Find Tumors Inside the Body
Activity by Decade
1970s1
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