Portfolio comparison
John L. Mason vs 0912139 B C Ltd
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 RE46892· 2018
The Design of a Specialized Pouch for Men's Underwear
Activity by Decade
2010s1
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