Portfolio comparison
John L. Mason vs FED TRUST Co
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 22186· 1858
John Mason's 1858 Patent for the Mason Jar Lid
Activity by Decade
1850s1
Top Patents1 enriched
US 775134· 1904
How King Gillette Invented the Modern Disposable Safety Razor
Activity by Decade
1900s1
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