Portfolio comparison
Theophilus Van Kannel vs 0912139 B C Ltd
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 387571· 1888
How the Revolving Door Was Invented
Activity by Decade
1880s1
Top Patents1 enriched
US RE46892· 2018
The Design of a Specialized Pouch for Men's Underwear
Activity by Decade
2010s1
How to use
Bookmark a comparison URL to save it. Format: /compare/companies?a=[slug]&b=[slug]. Also see patent-level comparison.