Portfolio comparison
William F. Semple vs Ultra Safe Nuclear
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 10475543· 2019
How to Make Meltdown-Proof Nuclear Fuel Pellets
Activity by Decade
2010s1
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