Portfolio comparison
Bose Corp vs Theophilus Van Kannel
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 5181252· 1993
How Bose Prevents Noise-Canceling Headphones From Breaking During Loud Sounds
Activity by Decade
1990s1
Top Patents1 enriched
US 387571· 1888
How the Revolving Door Was Invented
Activity by Decade
1880s1
How to use
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