Portfolio comparison
Owens Illinois Glass Co vs Theophilus Van Kannel
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 2133235· 1938
How Glass Fibers Are Spun for Insulation
Activity by Decade
1930s1
Top Patents1 enriched
US 387571· 1888
How the Revolving Door Was Invented
Activity by Decade
1880s1
How to use
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