Portfolio comparison
Sperry Gyroscope Co Inc vs MARY P JACOB
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 1242065· 1917
How Elmer Sperry Invented the Gyroscopic Compass for Ships
Activity by Decade
1910s1
Top Patents1 enriched
US 1115674· 1914
How Mary Phelps Jacob Invented the Modern Backless Brassiere
Activity by Decade
1910s1
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Bookmark a comparison URL to save it. Format: /compare/companies?a=[slug]&b=[slug]. Also see patent-level comparison.