Portfolio comparison
William F. Semple vs Cetus Oncology Corp
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 5397703· 1995
Using Insect Cells to Create Antibodies for Human Diseases
Activity by Decade
1990s1
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