Portfolio comparison
John L. Mason vs Morton Chemical 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 2880132· 1959
How Chemical Additives Boost the Effectiveness of Rodent Poisons
Activity by Decade
1950s1
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