Portfolio comparison
Phillips Screw Co vs John Harvey Kellogg
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Company A
Phillips Screw Co
Patents indexed
1
Year range
1936
Most recent
1936
mechanicalautomotiveconsumer_electronics
Top Patents1 enriched
US 2046343· 1936
The Invention of the Phillips Head Screw
Activity by Decade
1930s1
Top Patents1 enriched
US 558393· 1896
How John Harvey Kellogg Invented Flaked Breakfast Cereals
Activity by Decade
1890s1
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