Portfolio comparison
Hookless Fastener Co vs Theophilus Van Kannel
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Company A
Hookless Fastener Co
Patents indexed
1
Year range
1917
Most recent
1917
mechanicalconsumer_electronics
Top Patents1 enriched
US 1219881· 1917
How Gideon Sundback Invented the Modern Zipper
Activity by Decade
1910s1
Top Patents1 enriched
US 387571· 1888
How the Revolving Door Was Invented
Activity by Decade
1880s1
How to use
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